Sleep Disorders (PDQ®): Supportive care - Health Professional Information [NCI]

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Sleep Disorders (PDQ®): Supportive care - Health Professional Information [NCI]

This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at or call 1-800-4-CANCER.

Sleep Disorders


Sleep disturbances occur in about 10% to 15% of the general population [1] and are often associated with situational stress, illness, aging, and drug treatment.[2] It is estimated that one-third to one-half of people with cancer experience sleep disturbance.[3,4] Physical illness, pain, hospitalization, drugs and other treatments for cancer, and the psychological impact of a malignant disease may disrupt the sleeping patterns of persons with cancer.[5] Poor sleep adversely affects daytime mood and performance. In the general population, persistent insomnia has been associated with a higher risk of developing clinical anxiety or depression.[6] Sleep disturbances and, ultimately, sleep-wake cycle reversals can be early signs of a developing delirium. (Refer to the PDQ summary on Delirium for more information.) Adequate sleep may increase the cancer patient's pain tolerance.

Sleep consists of two phases: rapid eye movement (REM) sleep and non-REM (NREM) sleep.[7] REM sleep, also known as dream sleep, is the active or paradoxic phase of sleep in which the brain is active. NREM sleep is the quiet or restful phase of sleep. NREM, also referred to as slow wave sleep, is divided into four stages of progressively deepening sleep based on electroencephalogram findings.

The stages of sleep occur in a repeated pattern or cycle of NREM followed by REM, with each cycle lasting approximately 90 minutes. The sleep cycle is repeated four to six times during a 7- to 8-hour sleep period.[7] The sleep-wake cycle is dictated by an inherent biological clock or circadian rhythm. Disruptions in individual sleep patterns can disrupt the circadian rhythm and impair the sleep cycle.[8]

Five major categories of sleep disorders have been defined by the Sleep Disorders Classification Committee of the American Academy of Sleep Medicine:[9]

1.Disorders of initiating and maintaining sleep (insomnias).
2.Sleep-related breathing disorders (sleep apnea).
3.Disorders of excessive somnolence (hypersomnias).
4.Disorders of the sleep-wake cycle (circadian rhythm sleep disorders).
5.Dysfunctions associated with sleep, sleep stages, or partial arousals (parasomnias).

In this summary, unless otherwise stated, evidence and practice issues as they relate to adults are discussed. The evidence and application to practice related to children may differ significantly from information related to adults. When specific information about the care of children is available, it is summarized under its own heading.


1. National Sleep Foundation.: Can't Sleep? What To Know About Insomnia. Arlington, Va: National Sleep Foundation, 2011. Available online. Last accessed January 3, 2013.
2. Sateia MJ, Pigeon WR: Identification and management of insomnia. Med Clin North Am 88 (3): 567-96, vii, 2004.
3. Palesh OG, Roscoe JA, Mustian KM, et al.: Prevalence, demographics, and psychological associations of sleep disruption in patients with cancer: University of Rochester Cancer Center-Community Clinical Oncology Program. J Clin Oncol 28 (2): 292-8, 2010.
4. Savard J, Morin CM: Insomnia in the context of cancer: a review of a neglected problem. J Clin Oncol 19 (3): 895-908, 2001.
5. Berger AM: Update on the state of the science: sleep-wake disturbances in adult patients with cancer. Oncol Nurs Forum 36 (4): E165-77, 2009.
6. Ohayon MM, Caulet M, Lemoine P: Comorbidity of mental and insomnia disorders in the general population. Compr Psychiatry 39 (4): 185-97, 1998 Jul-Aug.
7. Hirshkowitz M: Normal human sleep: an overview. Med Clin North Am 88 (3): 551-65, vii, 2004.
8. Hrushesky WJ, Grutsch J, Wood P, et al.: Circadian clock manipulation for cancer prevention and control and the relief of cancer symptoms. Integr Cancer Ther 8 (4): 387-97, 2009.
9. American Academy of Sleep Medicine.: The International Classification of Sleep Disorders: Diagnostic & Coding Manual. 2nd ed. Westchester, Ill: American Academy of Sleep Medicine, 2005.

Sleep Disturbance in Cancer Patients

Cancer patients are at great risk for developing insomnia and disorders of the sleep-wake cycle. Insomnia is the most common sleep disturbance in this population and is most often secondary to physical and/or psychological factors related to cancer and/or cancer treatment.[1,2,3,4,5] Anxiety and depression, common psychological responses to the diagnosis of cancer, cancer treatment, and hospitalization, are highly correlated with insomnia.[6,7]

Sleep disturbances may be exacerbated by paraneoplastic syndromes associated with steroid production and by symptoms associated with tumor invasion, such as draining lesions, gastrointestinal (GI) and genitourinary (GU) alterations, pain, fever, cough, dyspnea, pruritus, and fatigue. Medications—including vitamins, corticosteroids, neuroleptics for nausea and vomiting, and sympathomimetics for the treatment of dyspnea—as well as other treatment factors can negatively impact sleep patterns.

Side effects of treatment that may affect the sleep-wake cycle include the following:[8]

  • Pain.
  • Anxiety.
  • Night sweats/hot flashes (refer to the PDQ summary on Fever, Sweats, and Hot Flashes for more information).
  • GI disturbances (e.g., incontinence, diarrhea, constipation, or nausea).
  • GU disturbances (e.g., incontinence, retention, or GU irritation).
  • Respiratory disturbances.
  • Fatigue.

Sustained use of the following medications commonly used in the treatment of cancer can cause insomnia:

  • Sedatives and hypnotics (e.g., glutethimide, benzodiazepines, pentobarbital, chloral hydrate, secobarbital sodium, and amobarbital sodium).
  • Cancer chemotherapeutic agents (especially antimetabolites).
  • Anticonvulsants (e.g., phenytoin).
  • Adrenocorticotropin.
  • Oral contraceptives.
  • Monoamine oxidase inhibitors.
  • Methyldopa.
  • Propranolol.
  • Atenolol.
  • Alcohol.
  • Thyroid preparations.

In addition, withdrawal from the following substances may cause insomnia:

  • CNS depressants (e.g., barbiturates, opioids, glutethimide, chloral hydrate, methaqualone, ethchlorvynol, alcohol, and over-the-counter and prescription antihistamine sedatives).
  • Benzodiazepines.
  • Major tranquilizers.
  • Tricyclic and monamine oxidase inhibitor antidepressants.
  • Illicit drugs (e.g., marijuana, cocaine, phencyclidine, and opioids).

Hypnotics can interfere with rapid eye movement (REM) sleep, resulting in increased irritability, apathy, and diminished mental alertness. Abrupt withdrawal of hypnotics and sedatives may lead to symptoms such as nervousness, jitteriness, seizures, and REM rebound. REM rebound has been defined as a marked increase in REM sleep with increased frequency and intensity of dreaming, including nightmares.[9] The increased physiologic arousal that occurs during REM rebound may be dangerous for patients with peptic ulcers or a history of cardiovascular problems. Newer medications for insomnia have reduced adverse effects.[10]

The sleep of hospitalized patients is likely to be frequently interrupted by treatment schedules, hospital routines, and roommates, which singularly or collectively alter the sleep-wake cycle. Other factors influencing sleep-wake cycles in the hospital setting include patient age, comfort, pain, and anxiety; and environmental noise and temperature.[11]

Consequences of sleep disturbances can influence outcomes of therapeutic and supportive care measures.[12] The patient with mild to moderate sleep disturbances may experience irritability and inability to concentrate, which may in turn affect the patient's compliance with treatment protocols, ability to make decisions, and relationships with significant others. Depression and anxiety can also be caused by sleep disturbances. Supportive care measures are directed toward promoting quality of life and adequate rest.


1. Savard J, Morin CM: Insomnia in the context of cancer: a review of a neglected problem. J Clin Oncol 19 (3): 895-908, 2001.
2. Savard J, Simard S, Blanchet J, et al.: Prevalence, clinical characteristics, and risk factors for insomnia in the context of breast cancer. Sleep 24 (5): 583-90, 2001.
3. Savard J, Simard S, Hervouet S, et al.: Insomnia in men treated with radical prostatectomy for prostate cancer. Psychooncology 14 (2): 147-56, 2005.
4. Otte JL, Carpenter JS, Russell KM, et al.: Prevalence, severity, and correlates of sleep-wake disturbances in long-term breast cancer survivors. J Pain Symptom Manage 39 (3): 535-47, 2010.
5. Lee ES, Lee MK, Kim SH, et al.: Health-related quality of life in survivors with breast cancer 1 year after diagnosis compared with the general population: a prospective cohort study. Ann Surg 253 (1): 101-8, 2011.
6. Bardwell WA, Profant J, Casden DR, et al.: The relative importance of specific risk factors for insomnia in women treated for early-stage breast cancer. Psychooncology 17 (1): 9-18, 2008.
7. Palesh OG, Roscoe JA, Mustian KM, et al.: Prevalence, demographics, and psychological associations of sleep disruption in patients with cancer: University of Rochester Cancer Center-Community Clinical Oncology Program. J Clin Oncol 28 (2): 292-8, 2010.
8. Vena C, Parker K, Cunningham M, et al.: Sleep-wake disturbances in people with cancer part I: an overview of sleep, sleep regulation, and effects of disease and treatment. Oncol Nurs Forum 31 (4): 735-46, 2004.
9. Chouinard G: Issues in the clinical use of benzodiazepines: potency, withdrawal, and rebound. J Clin Psychiatry 65 (Suppl 5): 7-12, 2004.
10. Barbera J, Shapiro C: Benefit-risk assessment of zaleplon in the treatment of insomnia. Drug Saf 28 (4): 301-18, 2005.
11. Boonstra L, Harden K, Jarvis S, et al.: Sleep disturbance in hospitalized recipients of stem cell transplantation. Clin J Oncol Nurs 15 (3): 271-6, 2011.
12. Sateia MJ, Doghramji K, Hauri PJ, et al.: Evaluation of chronic insomnia. An American Academy of Sleep Medicine review. Sleep 23 (2): 243-308, 2000.


Assessment is the initial step in management strategies. Assessment data should include documentation of predisposing factors, sleep patterns, emotional status, exercise and activity levels, diet, symptoms, medications, and caregiver routines.[1] The sections below outline recommendations for a sleep history and physical examination. Data can be retrieved from multiple sources: the patient's subjective report of sleep difficulty, objective observations of behavioral and physiologic manifestations of sleep disturbances, and reports from the patient's significant others regarding the patient's quality of sleep.[2] Use of the Insomnia Severity Index is suggested to screen for insomnia in clinical settings.[3,4]

The diagnosis of insomnia is primarily based on a careful, detailed medical and psychiatric history. The American Academy of Sleep Medicine has produced guidelines for the use of polysomnography as an objective tool in evaluating insomnia. The routine polysomnogram includes the monitoring of electroencephalography, electro-oculography, electromyography, effort of breathing and air flow, oxygen saturation, electrocardiography, and body position. Polysomnography is the major diagnostic tool in sleep disorders and is indicated in the evaluation of suspected sleep-related breathing disorders and periodic limb movement disorder, and when the cause of insomnia is uncertain or when behavioral or pharmacologic therapy is unsuccessful.[5][Level of evidence: IV]

Risk Factors for Sleep Disorders

  • Disease factors, including paraneoplastic syndromes with increased steroid production; and symptoms associated with tumor invasion (e.g., obstruction, pain, fever, shortness of breath, pruritus, and fatigue).
  • Treatment factors, including symptoms related to surgery (e.g., pain, frequent monitoring, and use of opioids); chemotherapy (e.g., exogenous corticosteroids); and symptoms related to chemotherapy.
  • Medications such as opioids, sedatives/hypnotics, steroids, caffeine/nicotine, some antidepressants, and dietary supplements, including some vitamins, diet pills, and other products promoting weight loss and appetite suppression.
  • Environmental factors.
  • Physical and/or psychological stressors.
  • Depression (refer to the PDQ summary on Depression for more information).
  • Anxiety (refer to the Anxiety Disorders: Description and Etiology section in the PDQ summary on Adjustment to Cancer: Anxiety and Distress for more information).
  • Delirium (refer to the PDQ summary on Delirium for more information).
  • Daytime seizures, snoring, and headaches.

Characterization of Sleep

  • Usual patterns of sleep, including usual bedtime, routine before retiring (e.g., food, bath, and medications), length of time before onset of sleep, and duration of sleep (awaking episodes during night, ability to resume sleep, and usual time of awakening).
  • Characteristics of disturbed sleep (changes following diagnosis, treatment, and/or hospitalization).
  • Perception of significant others as to quantity and quality of patient's sleep.
  • Family history of sleep disorders.


1. American Academy of Sleep Medicine.: The International Classification of Sleep Disorders: Diagnostic & Coding Manual. 2nd ed. Westchester, Ill: American Academy of Sleep Medicine, 2005.
2. Perlis ML, Jungquist C, Smith MT, et al.: Cognitive Behavioral Treatment of Insomnia: A Session-by-Session Guide. New York, NY: Springer Science+Business Media LLC, 2008.
3. Bastien CH, Vallières A, Morin CM: Validation of the Insomnia Severity Index as an outcome measure for insomnia research. Sleep Med 2 (4): 297-307, 2001.
4. Savard MH, Savard J, Simard S, et al.: Empirical validation of the Insomnia Severity Index in cancer patients. Psychooncology 14 (6): 429-41, 2005.
5. Littner M, Hirshkowitz M, Kramer M, et al.: Practice parameters for using polysomnography to evaluate insomnia: an update. Sleep 26 (6): 754-60, 2003.


Management of sleep disturbances should focus on treatment of problems with falling asleep, staying asleep, or early morning awakenings. Other areas to manage include symptoms from cancer and its treatment, and the identification and management of environmental and psychological factors. When sleep disturbances are caused by symptoms of cancer or treatment, measures that control or alleviate symptoms are often the key to resolving sleep disturbances. Management of sleep disturbances combines nonpharmacologic and pharmacologic approaches individualized for the patient.

Nonpharmacologic Management of Sleep Disturbances

Several large, randomized trials and meta-analyses provide the evidence base for the efficacy of cognitive behavioral therapy (CBT) for insomnia (CBT-I).[1,2,3] Almost all of these trials have been in populations of patients without cancer. Components of CBT-I include the following:

  • Cognitive restructuring.
  • Behavioral strategies.
  • Relaxation.
  • Basic sleep hygiene education.

Cognitive strategies include restructuring negative thoughts, beliefs, and attitudes related to sleep and preventing excessive monitoring or worrying about getting enough sleep.[1] Behavioral strategies include stimulus control and sleep restriction. Both of these strategies seek to limit time spent in bed that does not involve sleeping.[1,4,5]

Relaxation therapy can be used to achieve both behavioral and cognitive outcomes, particularly when it is combined with imagery. Educational objectives around sleep hygiene are also used to treat insomnia and include content on the following:[4]

  • Sleeping and waking up at regular times.
  • Relaxing before bedtime.
  • Creating a dark, comfortable sleep environment.
  • Avoiding watching television or working in the bedroom.
  • Getting ample daylight during nonsleep hours.
  • Avoiding naps.
  • Limiting caffeine.
  • Getting regular exercise but no closer than 3 hours before bedtime.

Practice guidelines from the American Academy of Sleep Medicine clearly state that multicomponent therapy is recommended over single therapies. Because of insufficient evidence about its efficacy, sleep hygiene education should not be recommended as a single-modality management approach; other reviews state that sleep hygiene by itself is not effective.[2,6] Information about sleep hygiene, although not sufficient alone to combat sleep disturbances, should be included as a foundation of education related to sleep issues.

Several trials and meta-analyses have shown CBT-I to be at least as effective as conventional pharmacological therapies in treating primary chronic insomnia, but without side effects.[2,3,7,8,9]

A four-arm study that evaluated zolpidem (Ambien) versus CBT versus zolpidem and CBT versus placebo reported a greater effect (P = .05) on sleep-onset latency for both groups involving CBT (change of 44%) versus the group receiving zolpidem alone (change of 29%).[10] Another study evaluated CBT with temazepam alone versus a combination of CBT and temazepam versus placebo and found that all active treatments were significantly better than placebo and that there was a trend for the most improvement in the combined arm of CBT and temazepam.[11] Both arms with CBT demonstrated greater reductions in time to sleep onset than did the pharmacotherapy-alone arm (64% combined arm, 55% CBT arm, and 47% temazepam arm). A meta-analysis examining pharmacologic and behavioral studies for persistent insomnia found that pharmacologic and behavioral treatments did not differ in magnitude of benefit except for latency to sleep onset, in which greater reductions were found with behavioral therapy.[3]

There are limited data evaluating elements of CBT-I in cancer survivors, and most of the data that exist are about women with breast cancer. However, there have been at least four randomized, controlled trials of CBT-I in cancer survivors.[12,13,14,15] The intervention was typically delivered over 5 to 8 weekly, small-group, in-person sessions. Only one of these trials included patients with cancer diagnoses other than breast cancer,[14] and results did not differ by cancer diagnosis. All studies showed improvements in numerous sleep parameters over time in the groups receiving CBT-I and demonstrated continued benefits 6 and 12 months later. Two of the four trials did not use active control arms.[12,14]

Both of the studies using active control arms were in breast cancer survivors. One study compared CBT-I with sleep education and hygiene in 72 women,[13] while the other study used a healthy-eating education control group.[15] In the study comparing CBT-I with sleep education and hygiene, both groups significantly improved over time, with some significant differences between groups favoring CBT-I for time to fall asleep, time awake after sleep, total sleep time, and overall sleep quality. For example, the group receiving CBT-I improved by 30 minutes in time to fall asleep, compared with 11 minutes in the sleep education and hygiene group.[13]

In the study utilizing the healthy-eating education control, 219 women were randomly assigned to a behavioral therapy group consisting of stimulus control, general sleep hygiene (limiting naps, going to bed and rising at consistent times), and relaxation or to a healthy-eating education control group. The interventions were delivered by trained nurses in person, 2 days before the initiation of chemotherapy and before each chemotherapy treatment as well as 30 days after the last chemotherapy treatment. The nurses worked with women assigned to behavioral therapy to individualize and reinforce the behaviors. The Pittsburgh Sleep Quality Index (PSQI) was used to measure subjective sleep quality but was complemented by use of a sleep diary and wrist actigraph. Sleep quality significantly improved in the group receiving behavioral therapy, compared with the control group. These differences were also seen in data from the sleep diary and actigraph, with both showing significantly fewer awakenings in the behavioral therapy group.[16] Sleep quality was significantly better at 90 days and 1 year in the behavioral therapy group, as measured by the PSQI but not the diary or actigraph.[15]

In a small randomized trial of 20 postmenopausal women receiving hormonal treatment for breast cancer, sleep scores on the PSQI improved more with a home-based walking intervention than with usual care.[17] Exercise is one of the elements of sleep hygiene.

Inpatient nonpharmacologic management

CBT delivered by psychologists has shown promise for the treatment of insomnia in patients with cancer.[12][Level of evidence: I] A randomized controlled study investigated the effectiveness of a protocol-driven cognitive behavioral intervention for insomnia delivered by oncology nurses.[14][Level of evidence: I] This group intervention consisted of standard CBT components such as stimulus control and sleep restriction. Participants included patients with heterogeneous cancers randomly assigned to receive the intervention (n = 100) or treatment as usual (n = 50). Primary outcomes were sleep diary measures at baseline, posttreatment, and at 6-month follow-up. CBT was associated with significant and sustained improvements in several sleep aspects. These improvements were seen for both subjective (sleep diary) and objective (actigraphy) assessments. Additionally, CBT patients showed significant improvements in fatigue, anxiety, and depressive symptoms and reported improved quality of life, compared with patients receiving treatment as usual.[14][Level of evidence: I]

Many people who experience insomnia have been found to practice poor sleep hygiene (such as smoking and drinking alcohol just before bedtime), which can exacerbate or perpetuate insomnia.[18][Level of evidence: III] Therefore, a complete assessment of sleep hygiene (i.e., time in bed; napping during the day; intake of caffeine, alcohol, or foods that are heavy, spicy, or sugary; exercise; and sleep environment) and use of behavioral management strategies (i.e., fixed bedtime; smoking, dietary, and alcohol restrictions 4–6 hours before bedtime; and increased exercise) may prove effective in reducing sleep disturbance.

Sleep hygiene in an inpatient setting involves modifying the sleep environment to decrease sleep disruption. Minimizing noise, dimming or turning off lights, adjusting room temperature, and consolidating patient care tasks to reduce the number of interruptions can increase the amount of uninterrupted sleep.[19][Level of evidence: IV

Other actions or interventions that may promote rest in the hospital or extended-care setting include the following:[20,21]

  • Keeping the patient's skin clean and dry.
  • Giving back rubs and/or massaging areas of the body to bring comfort to the patient (e.g., bony prominences, head and scalp, shoulders, hands, and feet).
  • Keeping bedding and/or surfaces of support devices (chairs and pillows) clean, dry, and wrinkle-free.
  • Ensuring adequate bedcovers for warmth.
  • Regulating fluid intake to avoid frequent awakening for elimination.
  • Encouraging bowel and bladder elimination before sleep.
  • Promoting optimal bowel function (increased fluids, dietary fiber, and use of stool softeners and laxatives).
  • Using a condom catheter for nocturnal incontinence.
  • Providing a high-protein snack 2 hours before bedtime (e.g., milk, turkey, or other foods high in tryptophan).
  • Avoiding beverages with caffeine and other stimulants, including dietary supplements that promote metabolism changes and appetite suppression.
  • Encouraging the patient to dress in loose, soft clothing.
  • Facilitating comfort through repositioning and support with pillows as needed.
  • Encouraging activity and being out of the bed as much as possible during waking hours.
  • Encouraging the patient to keep regular bedtime and awakening hours and avoid napping during the day.
  • Minimizing and coordinating necessary bedside contacts.

Psychological interventions are directed toward facilitating the patient's coping processes through education, support, and reassurance. As the patient learns to cope with the stresses of illness, hospitalization, and treatment, sleep may improve.[22][Level of evidence: IV] Communication, verbalization of concerns, and openness between the patient, family, and health care team should be encouraged. Relaxation exercises and self-hypnosis performed at bedtime can help promote calm and sleep. Cognitive-behavioral interventions that diminish the distress associated with early insomnia and change the goal from "need to sleep" to "just relax" can diminish anxiety and promote sleep.[23]

Pharmacologic Management of Sleep-Wake Cycle Disturbances

When cancer survivors experience sleep-wake disturbances, cognitive behavioral intervention counseling should be the first consideration for management. (Refer to the Nonpharmacologic Management of Sleep Disturbances section of this summary for more information.) It is acknowledged that resources for education and training in CBT may not be readily available in many cancer centers, and therefore community resources need to be investigated. In areas where CBT is not available or has been utilized but has not been successful, pharmacologic management can be considered. In addition, when patients have comorbidities contributing to sleep-wake cycle disturbances (such as hot flashes, uncontrolled pain, anxiety, depression, or other mood disturbances),[24,25] then pharmacologic management will probably be necessary. While many pharmacologic agents are approved for primary insomnia and many other agents are used off-label to manage sleep and related symptoms, most of the approved sleep aids have not been studied in cancer populations; therefore, the risk/benefit profiles of these drugs are not delineated in this setting.

Despite the lack of evidence in cancer populations, pharmacologic interventions are widely used by clinicians. Therefore, the following discussion of pharmacologic agents and recommendations for use is based on evidence from studies conducted in patients with primary insomnia and clinical experience.[4,26,27]

Several classes of medications are used to treat sleep-wake cycle disturbances:

  • Nonbenzodiazepine benzodiazepine receptor agonists (e.g., zolpidem).
  • Benzodiazepines (e.g., lorazepam).
  • Melatonin receptor agonists (e.g., ramelteon).
  • Antihistamines (e.g., hydroxyzine).
  • Antidepressants (e.g., trazodone) and antipsychotics (e.g., quetiapine) that have sedative effects.
  • Melatonin.

Drug characteristics that should be taken into account before a drug is chosen to treat an individual patient include the following:

  • Absorption.
  • Time to reach maximum concentration.
  • Elimination half-life.
  • Receptor activity.
  • Ability to cross the blood-brain barrier.
  • Dose and frequency.
  • Formulation (short-acting versus long-acting).

These pharmacokinetic principles are important for the matching of agents to the type of sleep disturbance (e.g., problems falling asleep versus problems staying asleep). There are also safety issues to be considered, such as potentials for tolerance, abuse, dependence, withdrawal (including risk of rebound insomnia), and drug-drug and drug-disease interactions. Medications for sleep-wake cycle disturbances should be used short-term and/or as needed.

The table below lists the medication categories and specific medications, including doses, commonly used within those categories.

Medications Commonly Used to Promote Sleep

Drug CategoryMedicationDoseComments
Nonbenzodiazepine benzodiazepine receptor agonistzaleplon (Sonata)5–20 mgUseful for problems falling asleep only.
zolpidem tartrate (Ambien)5–10 mgUseful for problems falling asleep only.
zolpidem tartrate extended-release (Ambien CR)6.25–12.5 mgBiphasic release; useful for problems both falling asleep and staying asleep; do not crush or split tablets.
eszopiclone (Lunesta)1–3 mgUseful for problems both falling asleep and staying asleep; do not take with or right after meal.
Benzodiazepinealprazolam (Xanax)0.25–2 mgHigher risk of withdrawal; side effects: lack of motor coordination, falls, and cognitive impairment.
lorazepam (Ativan)0.5–4 mgSide effects: lack of motor coordination, falls, and cognitive impairment.
clonazepam (Klonopin)0.5–4 mgSide effects: lack of motor coordination, falls, and cognitive impairment.
temazepam (Restoril)15–30 mgSide effects: lack of motor coordination, falls, and cognitive impairment.
Melatonin receptor agonistramelteon (Rozerem)8 mgLittle negative effect on cognition, somnolence, motor coordination, or nausea; useful for problems falling asleep only.
Antihistaminediphenhydramine (Benadryl)25–100 mgUseful for problems falling asleep only; good side-effect profile.
hydroxyzine (Vistaril, Atarax)10–100 mgUseful for problems falling asleep only; anticholinergic side effects.
Tricyclic antidepressantdoxepin (Sinequan)10–25 mgLower doses used for treatment of primary insomnia when antidepressant effect not needed; risk of anticholinergic side effects and weight gain.
amitriptyline (Elavil)10–15 mgLower doses used for treatment of primary insomnia when antidepressant effect not needed; risk of anticholinergic side effects and weight gain.
nortriptyline (Pamelor)10–50 mgRisk of anticholinergic side effects and weight gain.
Second-generation antidepressanttrazodone (Desyrel)25–200 mgRisk of orthostatic hypotension and falls.
mirtazapine (Remeron)7.5–45 mgIf depression not a concern, 7.5–15 mg best for sleep, hot flashes, increased appetite, and less morning sedation. Be aware of fall risk.
Antipsychoticquetiapine (Seroquel)25–100 mgRisk of weight gain, metabolic syndrome, abnormal/involuntary movements; possible cardiovascular effects (e.g., prolonged QT interval).
chlorpromazine (Thorazine)10–50 mgRisk of weight gain, metabolic syndrome, abnormal/involuntary movements; possible cardiovascular effects (e.g., hypotension).
Chloral derivativechloral hydrate0.5–1.0 gUsed mainly for sleep maintenance; risk of gastric irritation; risk of dependence and withdrawal; lethal in overdose.

Nonbenzodiazepine benzodiazepine receptor agonists (so-called Z-drugs)

All agents in this class are FDA approved for primary insomnia. These agents promote sleep by enhancing the effects of gamma-aminobutyric acid (GABA) at the GABA type A (GABAA) receptor. Unlike traditional benzodiazepines (e.g., lorazepam), the Z-drugs preferentially target specific GABAA receptor subtypes. Zolpidem and zaleplon bind predominantly to the alpha-1 subtype of GABAA, and eszopiclone preferentially targets the alpha-3 receptor subtype. This selective receptor subtype targeting has both advantages and disadvantages. The Z-drugs have mainly hypnotic/sedative effects and lack the anxiolytic, anticonvulsant, and myorelaxant effects seen with benzodiazepines. Conversely, because of the selective receptor subtype targeting, these agents have fewer effects on cognitive, psychomotor function and carry less risk of tolerance, dependence, and withdrawal (especially physical withdrawal) than do benzodiazepines.[4,26,27]

The Z-drugs are preferred for use in patients with cancer, when only hypnotic effects are desired, and should be taken just before bedtime (or even in bed) because they enter the brain very quickly; some of these agents (e.g., zaleplon) have a short elimination half-life. Because of their longer-lasting effects, zolpidem extended-release and eszopiclone are preferred in the treatment of difficulties in staying asleep. However, these agents carry a higher risk of residual morning sedation and cognitive/motor impairments than do agents with shorter elimination half-lives (e.g., zaleplon and zolpidem).


Benzodiazepines target several GABAA receptor subtypes, including alpha-1, -2, -3, and -5, and work by enhancing GABA effects at these receptors. In addition to hypnotic/sedative effects, these agents also have anxiolytic, anticonvulsant, and myorelaxant effects. Benzodiazepines are preferred when other effects (such as antianxiety or muscle relaxant effects) are desirable with or without the hypnotic effects.[4,26,27]

Benzodiazepines carry a much higher risk of tolerance, dependence, and withdrawal than do the Z-drugs. Benzodiazepine withdrawal has been associated with the risk of seizures, delirium tremens, autonomic instability, and death. These agents should be used with extreme caution and with close monitoring in patients with histories of significant substance use because these patients are vulnerable to tolerance and dependence issues. Benzodiazepines have also been associated with cognitive impairment and difficulties with motor coordination.

Generally, benzodiazepines with longer half-lives (e.g., clonazepam) are associated with a higher risk of residual morning sedation and cognitive/motor impairments. Agents with shorter elimination half-lives (e.g., lorazepam) are generally preferred for short-term anxiolytic effects and difficulties falling asleep and in elderly patients. Agents with longer half-lives (e.g., clonazepam) are preferred for the treatment of persistent anxiety and difficulties falling and staying asleep. All benzodiazepines are associated with risk of respiratory depression and should be used with caution in patients with preexisting respiratory disorders.

Melatonin receptor agonist: Ramelteon

Ramelteon, the only agent in this class, works by binding to the melatonin receptors. This agent is useful only for the treatment of difficulties falling asleep and does not have any other effects such as anxiolytic or myorelaxant effects. Ramelteon does not treat difficulties staying asleep but also carries much less risk of cognitive/motor impairments and dependence issues.[26,27]


Diphenhydramine and hydroxyzine work by decreasing arousal by blockading histamine receptors. Antihistamines are sold over the counter and are useful for treating difficulties in falling asleep only. There is limited evidence for the use of antihistamines to treat insomnia; these agents are used when traditional hypnotics or benzodiazepines are less suitable because of the risk of cross-dependence or other issues such as vulnerability of a patient to addictions. The anticholinergic properties of antihistamines may also be beneficial in the treatment of nausea and vomiting. The sedative and anticholinergic properties of these agents increase the risk of delirium, especially in older patients.[26,27]


Sedating antidepressants are considered first-line agents when insomnia is comorbid with depression/anxiety symptomatology. (Refer to the Pharmacologic Intervention section in the PDQ summary on Depression for more information.) These drugs include tricyclic antidepressants (e.g., amitriptyline) and second-generation antidepressants (e.g., mirtazapine). The sedating effects of tricyclic antidepressants are caused mainly by histamine receptor blockading and partially by blockading of 5-HT2 and muscarinic receptors. The sedating effects of mirtazapine are caused by its blocking of 5-HT2 and histamine receptors, while those of trazodone are caused by its blocking actions at the at histamine, 5-HT, and noradrenaline receptors.[4,26,27]

Tricyclic antidepressants have a small therapeutic window and can be lethal in overdose, compared with second-generation antidepressants such as mirtazapine. Additionally, tricyclics carry other risks, such as risk of weight gain, anticholinergic side effects, and cardiovascular side effects and should be used under close supervision. These agents sometimes are used in low doses (see table) as adjuncts to other antidepressants in the treatment of insomnia comorbid with depression/anxiety. This helps to avoid the side effects associated with higher doses while delivering the needed sedating effects. Tricyclics can also boost appetite and may be the treatment of choice for insomnia in patients with comorbid cachexia. Certain tricyclics (amitriptyline and nortriptyline) can also be beneficial in the treatment of pain syndromes (e.g., neuropathic pain) and headaches when these issues are comorbid with insomnia. Low doses of antidepressants (subtherapeutic for depression) are frequently used to treat insomnia without any comorbidities.

Mirtazapine, a second-generation antidepressant, also has appetite-stimulating and antiemetic properties in addition to sedating effects. It is frequently used in insomniac patients with depression (therapeutic dose for depression, 15–45 mg) or without depression (subtherapeutic doses for depression, 7.5–15 mg) with comorbid nausea or loss of appetite. In low doses, trazodone (50–150 mg) can promote sleep and is often combined with other antidepressants (e.g., fluoxetine 20 mg in the morning) in depressed patients with insomnia.


Antipsychotics such as quetiapine have sedating effects caused mainly by the blockade of histamine receptors. However, these agents should be considered as a last resort and as a short-term treatment because of their serious side-effect profile. The use of antipsychotics has been associated with weight gain, metabolic syndrome, diabetes, cardiovascular risks, and the risk of extrapyramidal side effects, including tardive dyskinesia. Antipsychotics can be considered for treatment-refractory insomnia, especially with comorbid anxiety symptomatology.[26]

Chloral derivative: Chloral hydrate

Chloral hydrate has sleep-promoting effects resulting from its effects on GABA systems. It is associated with risk of withdrawal symptoms similar to those of benzodiazepines and is associated with rapid development of tolerance. Additionally, chloral hydrate carries the risk of gastric irritation and multiple drug-drug interactions, and it is lethal in overdose. Like antipsychotics, chloral hydrate is usually considered only in cases of treatment-refractory insomnia because of its serious side-effect profile and the availability of safer alternatives.[26]

Botanical/dietary supplements


Melatonin, a hormone produced by the pineal gland during the hours of darkness, plays a major role in the sleep-wake cycle and has been linked to the circadian rhythm.[28] Adjuvant melatonin may also improve sleep disruption caused by drugs known to alter normal melatonin production (e.g., beta-blockers and benzodiazepines).[29][Level of evidence: IV] Supplementation with melatonin (2–4 mg in the evening) has been shown to improve sleep in children with endocrine tumors that diminish the natural production of the hormone.[30][Level of evidence: II] However, a meta-analysis of 25 studies exploring the efficacy and safety of melatonin in managing secondary sleep disorders or sleep disorders accompanying sleep restriction found that melatonin was not effective in either of these conditions.[31] The review found that short-term use of melatonin appears to be safe. However, these studies were not conducted in the context of cancer therapy.[28]

Evidence suggests that circulating melatonin levels are significantly lower in physically healthy older people and in insomniacs than in age-matched control subjects. In view of these findings, melatonin replacement therapy may be beneficial in the initiation and maintenance of sleep in elderly patients.[32][Level of evidence: II] A slow-release formulation of melatonin is licensed in Europe and is approved as monotherapy for patients aged 55 years or older for the short-term treatment (up to 13 weeks) of primary insomnia characterized by poor-quality sleep. However, melatonin replacement as a treatment for insomnia has not been studied in older people with cancer.

Melatonin may interact with certain chemotherapeutic regimens via the cytochrome P450 enzyme and other systems.[33] It may augment the effects of some chemotherapeutic agents metabolized via the enzyme CYP1A2 and may exert inhibitory effects on P-glycoprotein–mediated doxorubicin efflux.

Clinical studies in renal, breast, colon, lung, and brain cancer suggest that melatonin exerts anticancer effects in conjunction with chemotherapy and radiation therapy; however, evidence remains inconclusive.[34,35] All of the studies suggesting antitumor effects of melatonin have been conducted by the same group of investigators and were open label. Efforts by independent groups of investigators are under way to investigate these effects in carefully designed, randomized, blinded studies.[34]In vitro and animal studies have demonstrated the anticancer effects of exogenous melatonin, and lower melatonin levels are associated with tumor growth.[36] Human studies have yet to substantiate any causal or associative relationships.

Cannabisand cannabinoids

No studies have been conducted to specifically evaluate the effects of Cannabis inhalation or other Cannabis products in patients with primary or secondary sleep disturbances. Limited data from in vitro studies, animal studies, and small populations of healthy individuals or chronic Cannabis users are beginning to elucidate some of the relationships between various neurotransmitters and the sleep-wake cycle and related effects of Cannabis pharmacology.[37,38]

Cannabis-based medicines are under development as a treatment for chronic pain syndromes, including cancer-related pain. One such medication under investigation is nabiximols (Sativex), an oromucosal formulation (delta-9-tetrahydrocannabinol and cannabidiol mixed in a 1:1 ratio). Studies conducted with nabiximols, primarily focusing on pain syndromes, have shown improvement in subjective sleep quality when sleep was measured as a secondary outcome.[39] Comorbidities such as pain are common reasons for sleep disturbances. Concerns have been raised about the abuse and dependence potential of nabiximols, especially in the subpopulation of patients with histories of Cannabis use.[40] Nabiximols is approved in Canada for the treatment of central neuropathic pain in patients with multiple sclerosis. In the United States, it is only available for investigational use and is currently under investigation for the treatment of intractable cancer pain.

Current Clinical Trials

Check NCI's list of cancer clinical trials for U.S. supportive and palliative care trials about sleep disorders that are now accepting participants. The list of trials can be further narrowed by location, drug, intervention, and other criteria.

General information about clinical trials is also available from the NCI Web site.


1. Morin CM, Bootzin RR, Buysse DJ, et al.: Psychological and behavioral treatment of insomnia:update of the recent evidence (1998-2004). Sleep 29 (11): 1398-414, 2006.
2. Morin CM, Culbert JP, Schwartz SM: Nonpharmacological interventions for insomnia: a meta-analysis of treatment efficacy. Am J Psychiatry 151 (8): 1172-80, 1994.
3. Smith MT, Perlis ML, Park A, et al.: Comparative meta-analysis of pharmacotherapy and behavior therapy for persistent insomnia. Am J Psychiatry 159 (1): 5-11, 2002.
4. Becker PM: Pharmacologic and nonpharmacologic treatments of insomnia. Neurol Clin 23 (4): 1149-63, 2005.
5. Jacobs GD, Benson H, Friedman R: Home-based central nervous system assessment of a multifactor behavioral intervention for chronic sleep-onset insomnia. Behav Ther 24 (1): 159-74, 1993.
6. Morgenthaler T, Kramer M, Alessi C, et al.: Practice parameters for the psychological and behavioral treatment of insomnia: an update. An american academy of sleep medicine report. Sleep 29 (11): 1415-9, 2006.
7. Edinger JD, Wohlgemuth WK, Radtke RA, et al.: Cognitive behavioral therapy for treatment of chronic primary insomnia: a randomized controlled trial. JAMA 285 (14): 1856-64, 2001.
8. Berger AM, VonEssen S, Kuhn BR, et al.: Adherence, sleep, and fatigue outcomes after adjuvant breast cancer chemotherapy: results of a feasibility intervention study. Oncol Nurs Forum 30 (3): 513-22, 2003 May-Jun.
9. Berger AM, VonEssen S, Khun BR, et al.: Feasibilty of a sleep intervention during adjuvant breast cancer chemotherapy. Oncol Nurs Forum 29 (10): 1431-41, 2002 Nov-Dec.
10. Jacobs GD, Pace-Schott EF, Stickgold R, et al.: Cognitive behavior therapy and pharmacotherapy for insomnia: a randomized controlled trial and direct comparison. Arch Intern Med 164 (17): 1888-96, 2004.
11. Morin CM, Colecchi C, Stone J, et al.: Behavioral and pharmacological therapies for late-life insomnia: a randomized controlled trial. JAMA 281 (11): 991-9, 1999.
12. Savard J, Simard S, Ivers H, et al.: Randomized study on the efficacy of cognitive-behavioral therapy for insomnia secondary to breast cancer, part I: Sleep and psychological effects. J Clin Oncol 23 (25): 6083-96, 2005.
13. Epstein DR, Dirksen SR: Randomized trial of a cognitive-behavioral intervention for insomnia in breast cancer survivors. Oncol Nurs Forum 34 (5): E51-9, 2007.
14. Espie CA, Fleming L, Cassidy J, et al.: Randomized controlled clinical effectiveness trial of cognitive behavior therapy compared with treatment as usual for persistent insomnia in patients with cancer. J Clin Oncol 26 (28): 4651-8, 2008.
15. Berger AM, Kuhn BR, Farr LA, et al.: One-year outcomes of a behavioral therapy intervention trial on sleep quality and cancer-related fatigue. J Clin Oncol 27 (35): 6033-40, 2009.
16. Berger AM, Kuhn BR, Farr LA, et al.: Behavioral therapy intervention trial to improve sleep quality and cancer-related fatigue. Psychooncology 18 (6): 634-46, 2009.
17. Payne JK, Held J, Thorpe J, et al.: Effect of exercise on biomarkers, fatigue, sleep disturbances, and depressive symptoms in older women with breast cancer receiving hormonal therapy. Oncol Nurs Forum 35 (4): 635-42, 2008.
18. Jefferson CD, Drake CL, Scofield HM, et al.: Sleep hygiene practices in a population-based sample of insomniacs. Sleep 28 (5): 611-5, 2005.
19. Savard J, Morin CM: Insomnia in the context of cancer: a review of a neglected problem. J Clin Oncol 19 (3): 895-908, 2001.
20. Page M: Sleep pattern disturbance. In: McNally JC, Stair JC, Somerville ET, eds.: Guidelines for Cancer Nursing Practice. Orlando, Fla: Grune and Stratton, Inc., 1985, pp 89-95.
21. Kaempfer SH: Insomnia. In: Baird SB, ed.: Decision Making in Oncology Nursing. Philadelphia, Pa: B.C. Decker, Inc., 1988, pp 78-9.
22. Berlin RM: Management of insomnia in hospitalized patients. Ann Intern Med 100 (3): 398-404, 1984.
23. Horowitz SA, Breitbart W: Relaxation and imagery for symptom control in cancer patients. In: Breitbart W, Holland JC, eds.: Psychiatric Aspects of Symptom Management in Cancer Patients. Washington, DC: American Psychiatric Press, 1993, pp 147-71.
24. Jim HS, Small B, Faul LA, et al.: Fatigue, depression, sleep, and activity during chemotherapy: daily and intraday variation and relationships among symptom changes. Ann Behav Med 42 (3): 321-33, 2011.
25. Savard MH, Savard J, Trudel-Fitzgerald C, et al.: Changes in self-reported hot flashes and their association with concurrent changes in insomnia symptoms among women with breast cancer. Menopause 18 (9): 985-93, 2011.
26. Wilson SJ, Nutt DJ, Alford C, et al.: British Association for Psychopharmacology consensus statement on evidence-based treatment of insomnia, parasomnias and circadian rhythm disorders. J Psychopharmacol 24 (11): 1577-601, 2010.
27. Sullivan SS: Insomnia pharmacology. Med Clin North Am 94 (3): 563-80, 2010.
28. Buscemi N, Vandermeer B, Hooton N, et al.: Efficacy and safety of exogenous melatonin for secondary sleep disorders and sleep disorders accompanying sleep restriction: meta-analysis. BMJ 332 (7538): 385-93, 2006.
29. Dawson D, Encel N: Melatonin and sleep in humans. J Pineal Res 15 (1): 1-12, 1993.
30. Jan JE, Espezel H, Appleton RE: The treatment of sleep disorders with melatonin. Dev Med Child Neurol 36 (2): 97-107, 1994.
31. van Geijlswijk IM, Korzilius HP, Smits MG: The use of exogenous melatonin in delayed sleep phase disorder: a meta-analysis. Sleep 33 (12): 1605-14, 2010.
32. Haimov I, Lavie P, Laudon M, et al.: Melatonin replacement therapy of elderly insomniacs. Sleep 18 (7): 598-603, 1995.
33. Seely D, Stempak D, Baruchel S: A strategy for controlling potential interactions between natural health products and chemotherapy: a review in pediatric oncology. J Pediatr Hematol Oncol 29 (1): 32-47, 2007.
34. Lissoni P, Barni S, Mandalà M, et al.: Decreased toxicity and increased efficacy of cancer chemotherapy using the pineal hormone melatonin in metastatic solid tumour patients with poor clinical status. Eur J Cancer 35 (12): 1688-92, 1999.
35. Mills E, Wu P, Seely D, et al.: Melatonin in the treatment of cancer: a systematic review of randomized controlled trials and meta-analysis. J Pineal Res 39 (4): 360-6, 2005.
36. Mirick DK, Davis S: Melatonin as a biomarker of circadian dysregulation. Cancer Epidemiol Biomarkers Prev 17 (12): 3306-13, 2008.
37. Schierenbeck T, Riemann D, Berger M, et al.: Effect of illicit recreational drugs upon sleep: cocaine, ecstasy and marijuana. Sleep Med Rev 12 (5): 381-9, 2008.
38. Murillo-Rodriguez E, Poot-Ake A, Arias-Carrion O, et al.: The emerging role of the endocannabinoid system in the sleep-wake cycle modulation. Cent Nerv Syst Agents Med Chem 11 (3): 189-96, 2011.
39. Barnes MP: Sativex: clinical efficacy and tolerability in the treatment of symptoms of multiple sclerosis and neuropathic pain. Expert Opin Pharmacother 7 (5): 607-15, 2006.
40. Robson P: Abuse potential and psychoactive effects of δ-9-tetrahydrocannabinol and cannabidiol oromucosal spray (Sativex), a new cannabinoid medicine. Expert Opin Drug Saf 10 (5): 675-85, 2011.

Special Considerations

The Patient With Pain

Since enhanced pain control improves sleep, appropriate analgesics or nonpharmacologic pain management should be administered before introducing sleep medications. Tricyclic antidepressants can be particularly useful for the treatment of insomnia in patients with neuropathic pain and depression. Patients on high-dose opioids for pain may be at increased risk for the development of delirium and organic mental disorders. Such patients may benefit from the use of low-dose neuroleptics as sleep agents (e.g., haloperidol 0.5–1.0 mg).

The Older Patient

Older patients frequently have insomnia due to age-related changes in sleep. The sleep cycle in this population is characterized by lighter sleep, more frequent awakenings, and less total sleep time. Anxiety, depression, loss of social support, and a diagnosis of cancer are contributory factors in sleep disturbances in older patients.[1]

Sleep problems in older adults are so common that nearly half of all hypnotic prescriptions written are for persons older than 65 years. Although normal aging affects sleep, the clinician should evaluate the many factors that cause insomnia, such as medical illness, psychiatric illness, dementia, alcohol and/or polypharmacy, restless legs syndrome, periodic leg movements, and sleep apnea syndrome. Nonpharmacologic treatment of sleep disorders is the preferred initial management, with the use of medication when indicated and referral to a sleep disorder center when specialized care is necessary.[2]

Providing a regular schedule of meals, discouraging daytime naps, and encouraging physical activity may improve sleep. Hypnotic prescriptions for older patients must be adjusted for variations in metabolism, increased fat stores, and increased sensitivity. Dosages should be reduced by 30% to 50%. Problems associated with drug accumulation (especially flurazepam) must be weighed against the risks of more severe withdrawal or rebound effects associated with short-acting benzodiazepines. An alternate drug for older patients is chloral hydrate.[1]

Somnolence Syndrome in Children

Cranial irradiation and intrathecal methotrexate are used to prevent the development of central nervous system leukemia in children with acute lymphocytic leukemia. Somnolence syndrome (SS) is a complication of cranial irradiation occurring in 30% to 50% of patients who receive more than 18 Gy at daily dose fractions of 1.5 Gy to 2 Gy. The syndrome may appear 4 to 6 weeks posttherapy. SS is characterized by mild drowsiness to moderate lethargy and, occasionally, low-grade fever. The pathophysiology is unknown, but electroencephalogram and cerebral spinal fluid abnormalities are detectable in affected children. Although supportive care measures cannot prevent the occurrence of SS, acknowledgment of the existence of this problem may prevent or minimize anxieties for children and parents when symptoms of SS appear.

Sleep Apnea Following Mandibulectomy

Anterior mandibulectomy can result in the development of sleep apnea. All patients with head and neck tumors who have had extensive anterior oral cavity resection should be evaluated before decannulation of the tracheostomy tube. Subsequent flap and/or reconstruction of the lower jaw seems to prevent the development of sleep apnea. In contrast, facial sling suspension of the lower lip does not prevent the development of sleep apnea.[3] Assessment for symptoms and preparation for the appearance of symptoms in this population provide indications for interventions related to sleep apnea.


1. Berlin RM: Management of insomnia in hospitalized patients. Ann Intern Med 100 (3): 398-404, 1984.
2. Johnston JE: Sleep problems in the elderly. J Am Acad Nurse Pract 6 (4): 161-6, 1994.
3. Panje WR, Holmes DK: Mandibulectomy without reconstruction can cause sleep apnea. Laryngoscope 94 (12 Pt 1): 1591-4, 1984.

Changes to This Summary (01 / 09 / 2013)

The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

Editorial changes were made to this summary.

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About This PDQ Summary

Purpose of This Summary

This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the pathophysiology and treatment of sleep disorders. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.

Reviewers and Updates

This summary is reviewed regularly and updated as necessary by the PDQ Supportive and Palliative Care Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

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Some of the reference citations in this summary are accompanied by a level-of-evidence designation. These designations are intended to help readers assess the strength of the evidence supporting the use of specific interventions or approaches. The PDQ Supportive and Palliative Care Editorial Board uses a formal evidence ranking system in developing its level-of-evidence designations.

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