<unk>  <unk> , also known as the<unk>  sleep-phase type (ASPT) of circadian rhythm sleep disorder, is a condition that is characterized by a recurrent pattern of early evening (e.g. 7-9 pm) sleepiness and early morning awakening. This sleep<unk> <unk> ent can interfere with daily social and work schedules, and results in shortened sleep duration and excessive daytime sleepiness. The timing of sleep and melatonin levels are regulated by the body's central circadian clock, which is located in the suprachiasmatic nucleus in the hypothalamus.
Advanced sleep phase disorder
Delayed sleep phase disorder
Circadian rhythm sleep disorder
Non-24-hour sleep–wake disorder
Shift work sleep disorder
Nightmare disorder
Rapid eye movement sleep behavior disorder
Idiopathic hypersomnia