title: The function of sleep.
mesh_terms: D001921:Brain / Q000378:metabolism; D002455:Cell Division; D006728:Hormones / Q000378:metabolism; D006801:Humans; D012890:Sleep / Q000502:physiology*; D012894:Sleep Stages; D012895:Sleep, REM / Q000502:physiology
chemical_list: D006728:Hormones