Advanced Sleep Phase Disorder

Advanced sleep phase disorder (ASPD) is a circadian rhythm disorder in which sleep times are advanced (or timed early) relative to conventional or desired times. Individuals with ASPD experience overwhelming sleepiness in the late afternoon and early evening and chronic difficulty maintaining sleep during the latter half of the sleep period, often waking earlier than intended. This entry describes the clinical features, prevalence, and etiology of ASPD and discusses treatments.

Clinical Features

Patients with ASPD will go to bed between 7:00 p.m. and 9:00 p.m., typically after struggling to stay awake until then. Many individuals will report unintentionally falling asleep prior to going to bed, particularly while watching television, reading, or doing other quiet activities. Individuals with ASPD will not have any difficulty falling asleep at ...

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