|Title of host publication||The SAGE Encyclopedia of Abnormal and Clinical Psychology|
|Number of pages||3|
|Publication status||Published - 2017|
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 psychology
- sleep disorders
- sleep patterns