There are 5 stages of sleep. Stages 1-4 constitute non rapid eye movement sleep (NREM)
and stage 5 is rapid eye movement sleep (REM). We cycle through these approximately
every 90 minutes 4-6 times a night.
What is the most important stage of sleep?
There are 5 stages of sleep. Stages 1-4 constitute non rapid eye movement sleep (NREM)
and stage 5 is rapid eye movement sleep (REM). We cycle through these approximately
every 90 minutes 4-6 times a night.
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