title: Natural and "induced" sleep.
mesh_terms: D001463:Barbiturates / Q000494:pharmacology; D004155:Diphenhydramine / Q000494:pharmacology; D004569:Electroencephalography; D006801:Humans; D008702:Methaqualone / Q000494:pharmacology; D012890:Sleep / Q000187:drug effects*; D012895:Sleep, REM / Q000187:drug effects*
chemical_list: D001463:Barbiturates; D008702:Methaqualone; D004155:Diphenhydramine