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A member asked:
What number of stages of sleep are there?
A doctor has provided 1 answer
Four.: Sleep is divided into two general stages, REM (Rapid Eye Movement sleep), and NREM (non-REM) sleep. Furthermore, NREM sleep is currently divided into three stages (1,2 and 3), although up until recently there was defined a fourth stage as well. REM sleep is thought to be where most dreams occur. NREM sleep is staged by depth (stage 1 is drowsiness, 3 is deep sleep, 2 is in the middle).
Answered 5/16/2015
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