title: One gram of L-tryptophan fails to alter the time taken to fall asleep.
mesh_terms: D000328:Adult; D000368:Aged; D004032:Diet; D004311:Double-Blind Method; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010919:Placebos; D012890:Sleep / Q000187:drug effects*; D013997:Time Factors; D014364:Tryptophan / Q000494:pharmacology*
chemical_list: D010919:Placebos; D014364:Tryptophan