Circadian Rhythm Sleep Disorder

(circadian phase sleep disorder)

This Dyssomnia is diagnosed when the individual's own (endogenous) sleep-wake schedule is not synchronized with the schedule imposed from their environment, resulting in Insomnia and sleepiness which may occur regularly but at the inappropriate time.

Definition reprinted with permission from Culebras, Antonio Butterworth-Heinemann: Clinical Handbook of Sleep Disorders, 1e

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