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  2. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    The National Sleep Foundation recommends that adults aim for 7–9 hours of sleep per night, while children and teenagers require even more. For healthy individuals with normal sleep, the appropriate sleep duration for school-aged children is between 9 and 11 hours.

  3. Do you really need 8 hours of sleep every night? Sleep ... - AOL

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    Some people only need six and a half hours of sleep every night, Atwood adds, whereas others may need more than nine hours to feel rested and function the next day.

  4. Is 7 hours of sleep a night enough? Sleep doctors weigh in - AOL

    www.aol.com/news/7-hours-sleep-night-enough...

    Adults should sleep 7 or more hours per night. ... Some adults need nine or 10 hours of sleep every night to feel rested, says Harris, whereas others may find they only need seven, and sleeping ...

  5. Is 5 hours of sleep at night enough? - AOL

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    Is five hours of sleep enough? Doctors explain how much sleep you need, quality sleep basics, health effects of sleeping 5 hours and tips for better sleep.

  6. Sleep debt - Wikipedia

    en.wikipedia.org/wiki/Sleep_debt

    Main health effects of sleep deprivation, [1] indicating impairment of normal maintenance by sleep. Sleep debt or sleep deficit is the cumulative effect of not getting enough sleep. A large sleep debt may lead to mental or physical fatigue, and can adversely affect one's mood, energy, and ability to think clearly.

  7. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic , bifurcated , or bimodal ) sleep refers to two periods, while polyphasic usually means more than two. [ 1 ]

  8. Is 6 hours of sleep at night enough? - AOL

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    During the recommended seven to nine hours of sleep, we typically go through three to five sleep cycles per night, with the duration of REM sleep getting longer each subsequent time, Varga explains.

  9. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    Children need many hours of sleep per day in order to develop and function properly: up to 18 hours for newborn babies, with a declining rate as a child ages. [65] Early in 2015, after a two-year study, [ 91 ] the National Sleep Foundation in the US announced newly revised recommendations as shown in the table below.

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