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  2. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1] Within the sleep of adults and infants there are cyclic fluctuations between quiet and active sleep.

  3. The 7 Most Effective Natural Sleep Aids for Your Best Sleep ...

    www.aol.com/lifestyle/7-most-effective-natural...

    In sleep medicine, we use very small doses of melatonin multiple hours before bed to help gradually shift the body’s clock (circadian rhythm) in people with delayed sleep phase disorder, jet lag ...

  4. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    The human circadian rhythm regulates the human sleep-wake cycle of wakefulness during the day and sleep at night. Ekirch suggests that it is due to the modern use of electric lighting that most modern humans do not practice interrupted sleep, which is a concern for some writers. [ 18 ]

  5. Psychological stress and sleep - Wikipedia

    en.wikipedia.org/wiki/Psychological_stress_and_Sleep

    This time allows for the body to recharge and return to a phase of optimal functioning. It is recommended that adults get 7 to 9 hours of sleep each night. Sleep is regulated by an internal process known as the circadian rhythm. This 24-hour cycle regulates periods of alertness and tiredness that an individual experiences. [3]

  6. 7 Factors That Affect Your Natural Sleep-Wake Cycle - AOL

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  7. Amazon shoppers rave about this 'life changer' natural sleep ...

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    This liquid contains a mix of all-natural vitamins and minerals — calcium, magnesium, zinc and more — that have been proven to improve sleep quality. Save $22 with 40% off coupon $25 at Amazon

  8. Light effects on circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Light_effects_on_circadian...

    Cortisol levels are high upon waking and gradually decrease over the course of the day, melatonin levels are high when the body is entering and exiting a sleeping status and are very low over the course of waking hours. [9] The earth's natural light-dark cycle is the basis for the release of these hormones. [13]

  9. Irregular Sleep-Wake Cycles May Raise Heart Attack, Stroke ...

    www.aol.com/lifestyle/irregular-sleep-wake...

    A 2023 study published in Sleep found that sleep regularity was a stronger predictor of overall mortality risk than sleep duration. Participants with higher SRI scores had as much as a 48% lower ...

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