Term Name:	sleep
Synonyms:	diapause, dormancy, lethargus
Definition:	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.
Ontology:	GO: Biological Process [GO:0030431]    QuickGO    AmiGO