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