title: Ultradian circa 11/2 hour rhythms: a multioscillatory system.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D005769:Gastrointestinal Motility; D012890:Sleep / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology; D014554:Urination; D014851:Wakefulness / Q000502:physiology