Delayed Sleep Phase Disorder

Delayed sleep phase disorder (DSPD) is characterized by sleep times that are delayed (or timed late) compared with desired or socially conventional sleep times. This entry discusses clinical features, prevalence, etiology, and treatment of DSPD.

Clinical Features

Individuals with DSPD have chronic difficulty falling asleep at their desired bedtime and are unable to spontaneously wake up in the morning at the desired time. For example, the individual may wish to sleep between 11:00 p.m. and 7:00 a.m. but is unable to fall asleep until 2:00 a.m. Once asleep, individuals with DSPD typically sleep soundly. However, when required to wake up at a socially conventional time in order to fulfill work, school, or social commitments, sleep time is substantially reduced. Reduced sleep time, particularly when occurring over several ...

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