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  2. Circadian rhythm sleep disorder - Wikipedia

    en.wikipedia.org/.../Circadian_rhythm_sleep_disorder

    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]

  3. Delayed sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

    That such an alteration has also been observed in temporal isolation (i.e.; in absence of all external time cues) supports the notion that the etiology of DSPD goes beyond simply a reduced capacity to achieve and maintain the appropriate phase relationship between sleep timing and the 24-hour day. Rather, the disorder may also reflect a ...

  4. Non-24-hour sleep–wake disorder - Wikipedia

    en.wikipedia.org/wiki/Non-24-hour_sleep–wake...

    Non-24-hour sleep–wake disorder (non-24, [1] N24SWD, [2] or N24) is one of several chronic circadian rhythm sleep disorders (CRSDs). It is defined as a "chronic steady pattern comprising [...] daily delays in sleep onset and wake times in an individual living in a society". [3]

  5. 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 ]

  6. Irregular sleep–wake rhythm disorder - Wikipedia

    en.wikipedia.org/wiki/Irregular_sleep–wake...

    Irregular sleep–wake rhythm disorder (ISWRD) is a rare form of circadian rhythm sleep disorder. [2] [3] It is characterized by numerous naps throughout the 24-hour period, no main nighttime sleep episode, and irregularity from day to day. [4]

  7. Is Waking Up in the Middle of the Night Normal? Here's What ...

    www.aol.com/waking-middle-night-normal-heres...

    A sleep medicine specialist can help diagnose or rule out any underlying medical conditions that may be causing you to wake up at night. They can also make suggestions specific to the reasons that ...

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

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

    We get into a pattern of waking and sleeping that sees us opening our eyes in the middle of the night. The room is dark, but sure enough, the clock reads the same time as it did the night before...

  9. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    A 2004 editorial in the journal Sleep stated that, according to the available data, the average number of hours of sleep in a 24-hour period has not changed significantly in recent decades among adults. Furthermore, the editorial suggests that there is a range of normal sleep time required by healthy adults, and many indicators used to suggest ...