Tryptophan and sleep.
D000284:Administration, Oral; D006801:Humans; D006993:Hypnotics and Sedatives; D010919:Placebos; D012890:Sleep / Q000187:drug effects*; D014364:Tryptophan / Q000008:administration & dosage / Q000627:therapeutic use*
D006993:Hypnotics and Sedatives; D010919:Placebos; D014364:Tryptophan