Delayed sleep-wake phase disorder

Definition

Delayed sleep-wake phase disorder is a recurrent pattern of disturbance of the sleep-wake schedule characterised by persistent delay in the major sleep period compared to conventional or desired sleep times. The disorder results in difficulty falling asleep and difficulty awakening at desired or required times. When sleep is allowed to occur on the delayed schedule, it is essentially normal in quality and duration. The symptoms should have persisted for at least several months and result in significant distress or mental, physical, social, occupational or academic impairment.

Inclusions

• delayed sleep phase syndrome

Also indexed as

Nearby in Circadian rhythm sleep-wake disorders

• 7A61Advanced sleep-wake phase disorder
• 7A62Irregular sleep-wake rhythm disorder
• 7A63Non-24 hour sleep-wake rhythm disorder
• 7A64Circadian rhythm sleep-wake disorder, shift work type
• 7A65Circadian rhythm sleep-wake disorder, jet lag type
• 4B4ZDiseases of the immune system, unspecified