Sleep efficiency for sleep-wake cycles of varied length.
D000293:Adolescent; D000328:Adult; D002940:Circadian Rhythm; D006801:Humans; D008297:Male; D010507:Periodicity; D011930:Reaction Time; D012890:Sleep; D012893:Sleep Wake Disorders / Q000209:etiology; D013997:Time Factors; D014851:Wakefulness