State and rhythmic processes.
D000328:Adult; D000818:Animals; D001143:Arousal / Q000502:physiology; D002415:Cats; D002652:Child Behavior; D002657:Child Development / Q000502:physiology; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008959:Models, Neurological; D018377:Neurotransmitter Agents / Q000502:physiology; D010507:Periodicity; D012890:Sleep / Q000502:physiology
D018377:Neurotransmitter Agents