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

    How Much Sleep Do I Need - Sleep Need - Average Sleep Need - How many hours of sleep do I need? The average adult sleeps less than 7 hours per night. Sleep requirements for Newborns, Infants, Toddlers, Preschoolers, School-aged children, Teens, Adults. Source: Helpguide http://ygraph.com/chart/2078

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