Stages of Sleep Sleep stages are divided into non–rapid eye
movement (non-REM) and rapid eye movement (REM). Non-REM (NREM)
sleep Non–rapid eye movement (NREM) sleep has 3 stages: REM (R)
sleep Rapid eye movement sleep is deeper than non-REM sleep.
During REM sleep: 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.
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