Source:http://linkedlifedata.com/resource/umls/id/C0037313
MSH: A readily reversible suspension of sensorimotor interaction with the environment, usually associated with recumbency and immobility.,CSP: period of rest for the body and mind during which volition and consciousness are in partial or complete abeyance and bodily functions are partially suspended; a behavioral state marked by a characteristic immobile posture and diminished but readily reversible sensitivity to external stimuli.,GO: Any process in which an organism enters and maintains a periodic, readily reversible state of reduced awareness and metabolic activity. Usually accompanied by physical relaxation, the onset of sleep in humans and other mammals is marked by a change in the electrical activity of the brain. [ISBN:0192800981],NCI: A natural and periodic state of rest during which consciousness of the world is suspended. (WordNet)