Sleep and instinctive behavior.
D000818:Animals; D001522:Behavior, Animal; D002415:Cats; D003259:Consummatory Behavior; D004558:Electric Stimulation; D004569:Electroencephalography; D005010:Ethology; D006706:Homeostasis; D006801:Humans; D007323:Instinct; D051381:Rats; D012154:Reticular Formation / Q000502:physiology; D012890:Sleep; D012895:Sleep, REM; D013788:Thalamus / Q000502:physiology; D014851:Wakefulness