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  2. Delayed sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

    The symptoms do not meet the criteria for any other sleep disorder causing inability to initiate sleep or excessive sleepiness. If one of the following laboratory methods is used, it must demonstrate a significant delay in the timing of the habitual sleep period: 1) 24-hour polysomnographic monitoring (or two consecutive nights of ...

  3. Excessive daytime sleepiness - Wikipedia

    en.wikipedia.org/wiki/Excessive_daytime_sleepiness

    Excessive daytime sleepiness (EDS) is characterized by persistent sleepiness and often a general lack of energy, even during the day after apparently adequate or even prolonged nighttime sleep. EDS can be considered as a broad condition encompassing several sleep disorders where increased sleep is a symptom, or as a symptom of another ...

  4. Insomnia - Wikipedia

    en.wikipedia.org/wiki/Insomnia

    It can be caused by another disorder, by changes in the sleep environment, by the timing of sleep, severe depression, or by stress. Its consequences – sleepiness and impaired psychomotor performance – are similar to those of sleep deprivation. [102] Acute insomnia is the inability to consistently sleep well for a period of less than a month ...

  5. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    Once one catches up on sleep, one's mood will often return to baseline or normal. Even partial sleep deprivation can have a significant impact on mood. In one study, subjects reported increased sleepiness, fatigue, confusion, tension, and total mood disturbance, which all recovered to their baseline after one to two full nights of sleep. [56] [57]

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

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

    For example, an individual with a circadian period of 24.5 hours would drift 30 minutes later each day and would be maximally misaligned every 48 days. If patients set their own schedule for sleep and wake, aligned to their endogenous non-24 period (as is the case for most sighted patients with this disorder), symptoms of insomnia and wake-time ...

  7. 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]

  8. When the winter days get shorter, the nation's sleep and ...

    www.aol.com/news/winter-days-shorter-nations...

    A CDC study detailed that one in three adults report poor sleep, with daylight exposure being one of the main factors that influence the quality of their sleep. When you're not getting enough ...

  9. Chronotype - Wikipedia

    en.wikipedia.org/wiki/Chronotype

    A person's chronotype is the propensity for the individual to sleep at a particular time during a 24-hour period. Eveningness (delayed sleep period; most active and alert in the evening) and morningness (advanced sleep period; most active and alert in the morning) are the two extremes with most individuals having some flexibility in the timing ...