title: Sleep and insomnia in the elderly.
mesh_terms: D000368:Aged; D002940:Circadian Rhythm / Q000187:drug effects; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use; D009410:Nerve Degeneration / Q000187:drug effects; D012043:Regression, Psychology; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis* / Q000523:psychology; D012894:Sleep Stages / Q000187:drug effects; D012895:Sleep, REM / Q000187:drug effects
chemical_list: D006993:Hypnotics and Sedatives