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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]
EDS can be a symptom of a number of factors and disorders. Specialists in sleep medicine are trained to diagnose them. Some are: Insufficient quality or quantity of night time sleep [5] Obstructive sleep apnea [6] Misalignments of the body's circadian pacemaker with the environment (e.g., jet lag, shift work, or other circadian rhythm sleep ...
According to the International Classification of Sleep Disorders, Revised (ICSD-R, 2001), [10] the circadian rhythm sleep disorders share a common underlying chronophysiologic basis: The major feature of these disorders is a misalignment between the patient's sleep-wake pattern and the pattern that is desired or regarded as the societal norm...
All of these are examples of circadian rhythm disorders, which are problems with the alignment between your sleep-wake cycle and your responsibilities for the day—like going to work or school ...
The clinical histories, sleep logs and actigraphy patterns of subject families were used to define a hereditary circadian rhythm variant associated with a short endogenous (i.e. internally-derived) period. The subjects demonstrated a phase advance of sleep-wake rhythms that was distinct not only from control subjects, but also to sleep-wake ...
Circadian rhythm sleep disorders. Delayed sleep phase disorder; Advanced sleep phase disorder; Non-24-hour sleep–wake disorder; Parasomnias – A category of sleep disorders that involve abnormal and unnatural movements, behaviors, emotions, perceptions, and dreams in connection with sleep. Bedwetting or sleep enuresis; Bruxism (Tooth-grinding)