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Sleep stages are divided into non–rapid eye movement (non-REM) and
rapid eye movement (REM).
Non–rapid eye movement (NREM) sleep has 3 stages:
Rapid eye movement sleep is deeper than non-REM sleep. During REM
You do most of your dreaming during REM sleep. But your brain paralyzes your muscles so you do not act out the dreams.
During sleep, a person usually progresses through the 3 stages of
non-REM sleep before entering REM sleep. This takes about 1 to 2 hours
after falling asleep. The cycle is repeated three to four times each night. And adult spends more time in NREM sleep than in REM sleep. An infant usually spends about half of the sleeping time in NREM and half in REM stages.
June 17, 2011
Anne C. Poinier, MD - Internal Medicine & Mark A. Rasmus, MD - Pulmonology, Critical Care Medicine, Sleep Medicine
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