Basic rest-activity cycle--22 years later.
D000204:Activity Cycles; D000818:Animals; D001921:Brain / Q000502:physiology; D002415:Cats; D002648:Child; D002940:Circadian Rhythm; D004325:Dreams; D004569:Electroencephalography; D000882:Haplorhini; D006801:Humans; D009043:Motor Activity; D012895:Sleep, REM / Q000502:physiology; D014851:Wakefulness / Q000502:physiology