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  2. Why do I wake up at 3 a.m. every night? - AOL

    www.aol.com/keep-waking-middle-night-could...

    Waking up several times throughout the night is typically not disruptive to one’s health, as long as falling back asleep occurs within about five to 10 minutes, said Dr. Michelle Drerup ...

  3. Waking at the same time each night reveals details ... - AOL

    www.aol.com/article/2016/07/14/waking-at-the...

    3am - 5am: Lungs. Morgan Swofford for LittleThings ... Like the liver, the large intestine clears waste from the body and is the final stop for any unwanted food products. If you wake up during ...

  4. Need to start waking up earlier — or stay up later? Sleep ...

    www.aol.com/lifestyle/start-waking-earlier-stay...

    "Adjusting to longer-term patterns (e.g., a night owl needing to get up earlier) is trickier since your system acts as a rubber band, snapping back to its preferred biology as soon as you change ...

  5. Cortisol awakening response - Wikipedia

    en.wikipedia.org/wiki/Cortisol_awakening_response

    Waking up earlier in the morning increases the response. [11]Shift work: nurses working on morning shifts with very early awakening (between 4:00–5:30 a.m.) had a greater and prolonged cortisol awakening response than those on the late day shift (between 6:00–9:00 a.m.) or the night shift (between 11:00 a.m.–2:00 p.m.). [12]

  6. Middle-of-the-night insomnia - Wikipedia

    en.wikipedia.org/wiki/Middle-of-the-night_insomnia

    Middle-of-the-night insomnia, or "sleep maintenance insomnia", also called terminal insomnia in contrast with "initial insomnia", is characterized by having difficulty returning to sleep after waking up during the night or very early in the morning. Initial or "sleep-onset" insomnia consists of having difficulty falling asleep at the beginning ...

  7. Sleep paralysis - Wikipedia

    en.wikipedia.org/wiki/Sleep_paralysis

    Sleep paralysis is a state, during waking up or falling asleep, in which a person is conscious but in a complete state of full-body paralysis. [1] [2] During an episode, the person may hallucinate (hear, feel, or see things that are not there), which often results in fear. [1] [3] Episodes generally last no more than a few minutes. [2]

  8. When is the best time to wake up? The ideal waking time ... - AOL

    www.aol.com/news/best-time-wake-ideal-waking...

    How does the body decide to wake up? The science behind waking up comes down to a combination of factors and environmental cues, but the most important is sunlight. "Our (bodies wake) up because ...

  9. Circadian rhythm sleep disorder - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm_sleep...

    A circadian rhythm is an entrainable, endogenous, biological activity that has a period of roughly twenty-four hours. This internal time-keeping mechanism is centralized in the suprachiasmatic nucleus (SCN) of humans, and allows for the internal physiological mechanisms underlying sleep and alertness to become synchronized to external environmental cues, like the light-dark cycle. [4]