Melatonin.
D000368:Aged; D002940:Circadian Rhythm / Q000187:drug effects; D018849:Controlled Clinical Trials as Topic; D018592:Cross-Over Studies; D004341:Drug Evaluation; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use; D008550:Melatonin / Q000592:standards / Q000627:therapeutic use*; D007319:Sleep Initiation and Maintenance Disorders / Q000517:prevention & control; D014195:Travel
D006993:Hypnotics and Sedatives; D008550:Melatonin