1. Sleep Cycle - Sleep Stages - Sleep Diagram - How Much Sleep Do I Need - Sleep Dream Cycle - R.E.M. Sleep - Circadian Rhythm sleepcycle

    Circadian Rhythm: The Circadian Rhythm is a 24 hour cycle that the human body goes through. The day and night sleep cycle: 6 to 10 hour period in which we sleep. This sleep period includes both deep sleep, and REM sleep. Ultradian Rhythm. Source: Luciddreamexplorers http://ygraph.com/chart/2077

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