title: Time out.
mesh_terms: D001683:Biological Clocks / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D004526:Efficiency / Q000502:physiology; D006801:Humans; D012890:Sleep / Q000502:physiology; D013995:Time; D014851:Wakefulness / Q000502:physiology