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  2. Paroxysmal nocturnal dyspnoea - Wikipedia

    en.wikipedia.org/wiki/Paroxysmal_nocturnal_dyspnoea

    With paroxysmal nocturnal dyspnea specifically, it is felt while sleeping and causes a person to wake up after about 1 to 2 hours of sleep. [ 3 ] More serious forms of dyspnea can be identified through accompanying findings, such as low blood pressure, decreased respiratory rate, altered mental status, hypoxia, cyanosis, stridor, or unstable ...

  3. 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. [3]

  4. 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. [citation needed]

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

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

    If you notice that you're waking up in the middle of the night, feeling exhausted in the middle of the day, or experiencing some other unpleasantness at the same time each day or night, consider ...

  6. Parasomnia - Wikipedia

    en.wikipedia.org/wiki/Parasomnia

    Sleep walking may involve sitting up and looking awake when the individual is actually asleep, and getting up and walking around, moving items or undressing themselves. They will also be confused when waking up or opening their eyes during sleep. Sleep walking can be associated with sleeptalking. [19]

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

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

    The possible causes of non-24-hour sleep-wake disorder are 2-fold: (1), extrinsic: isolation from daily light cycles (such as working in an environment completely devoid of natural lighting); [citation needed] and (2), intrinsic: where some condition, such as blindness or malfunctioning biochemical response to light in the subject, prevent ...

  8. Myoclonus - Wikipedia

    en.wikipedia.org/wiki/Myoclonus

    Myoclonus is a brief, involuntary, irregular (lacking rhythm) twitching of a muscle, a joint, or a group of muscles, different from clonus, which is rhythmic or regular.. Myoclonus (myo-"muscle", clonus "spasm") describes a medical sign and, generally, is not a diagnosis of a dis

  9. Hypnic jerk - Wikipedia

    en.wikipedia.org/wiki/Hypnic_jerk

    A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.

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