title: A model of activity and sleep.
mesh_terms: D000818:Animals; D001143:Arousal; D001921:Brain / Q000502:physiology; D002940:Circadian Rhythm; D005221:Fatigue; D008433:Mathematics; D008954:Models, Biological; D009043:Motor Activity; D005082:Physical Exertion; D051381:Rats; D012890:Sleep