<unk>  <unk>  is a sleep disorder in which patients feel very sleepy early in the evening (e.g. 18:00-19:00) and wake up very early in the night (e.g. midnight, 1:00, etc.). It is the opposite of delayed sleep phase syndrome.<unk>  is frequently encountered in the elderly and in post-menopausal women. It can be treated pharmacologically, with evening bright lights, or behaviorally with chronotherapy or free-running sleep.
Advanced sleep phase syndrome
Delayed sleep phase syndrome
Circadian rhythm sleep disorder
Non-24-hour sleep-wake syndrome
Non-rapid eye movement sleep arousal disorder
Shift work sleep disorder
Caffeine-induced sleep disorder
Nightmare disorder