Advanced sleep-wake phase disorder (Q41268)

Advanced sleep-wake phase disorder is a recurrent pattern of disturbance of the sleep-wake schedule characterised by persistent advance (to an earlier time) of the major sleep period compared to conventional or desired sleep times. The disorder results in evening sleepiness (prior to the desired bedtime) and awakening earlier than the desired or required times. When sleep is allowed to occur on the advanced 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.