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  2. Delayed sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

    A 2002 study of older adults (age 40–65) in San Diego found 3.1% had complaints of difficulty falling asleep at night and waking in the morning, but did not apply formal diagnostic criteria. [63] Actimetry readings showed only a small proportion of this sample had delays of sleep timing.

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

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

    The most important thing to do when waking up in the middle of the night is to resist looking at the clock, Peters-Mathews said. “If the alarm is not going off, it’s not time to wake up. It ...

  4. Do you wake up at 4am? Scientists know what might be ... - AOL

    www.aol.com/news/do-you-wake-up-at-4-am...

    Researchers studied 300 people with ‘advanced sleep phase’.

  5. 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]

  6. Sleep inertia - Wikipedia

    en.wikipedia.org/wiki/Sleep_inertia

    Sleep inertia is a physiological state of impaired cognitive and sensory-motor performance that is present immediately after awakening. It persists during the transition of sleep to wakefulness, where an individual will experience feelings of drowsiness, disorientation and a decline in motor dexterity.

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

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

    Therefore, waking up at the same time each night indicates an issue with that body part, or the emotions associated with it. ... they're offering a risk-free 100-night trial guarantee that every ...

  8. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    This is an accepted version of this page This is the latest accepted revision, reviewed on 7 March 2025. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...

  9. Why Am I Waking Up with Headaches? A Sleep Expert Helps Us ...

    www.aol.com/why-am-waking-headaches-sleep...

    You slept eight luxurious hours last night (or, you know, at least six). But as soon as you sat up in bed this morning, you noticed it. The throbbing temples. The pounding at the base of your ...