title: Editorial: L-tryptophan: a possible natural hypnotic substance.
mesh_terms: D006916:5-Hydroxytryptophan / Q000378:metabolism; D001812:Blood-Brain Barrier; D001933:Brain Stem / Q000378:metabolism; D002986:Clinical Trials as Topic; D006801:Humans; D006993:Hypnotics and Sedatives; D010919:Placebos; D012701:Serotonin / Q000378:metabolism; D012890:Sleep / Q000187:drug effects*; D012894:Sleep Stages; D013997:Time Factors; D014364:Tryptophan / Q000008:administration & dosage / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D006993:Hypnotics and Sedatives; D010919:Placebos; D012701:Serotonin; D014364:Tryptophan; D006916:5-Hydroxytryptophan