Delayed sleep wake phase disorder

What is delayed sleep wake phase disorder? 

Delayed sleep wake phase disorder is characterized by habitual sleep–wake timing that is delayed, usually by more than 2 hours, relative to the conventional or socially acceptable timing.

Affected individuals will have difficulty falling asleep and waking up at a socially acceptable time, as required to obtain sufficient sleep duration on a school or work night.

The condition is more common among adolescents and young adults. The symptoms last about 3 months.

When allowed to follow the individual’s preferred schedule, the individual’s timing of sleep is delayed.


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