How many hours of sleep is optimal? What are the effects of sleep deprivation? What are the distinguishing characteristics of REM and non-REM sleep?

If sleep at 9 pm and wake at 3 am you will in rem stage.Rem stage is stage when start to get dreaMS

A full eight hours of sleep should be enough for your body to go towards REM sleep. REM sleep is the stage in which your body goes through four stages of sleep, it is very important for the human body to function. REM sleep usually starts about 90 minutes after you fall asleep.

Explanation:

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