<prompt> Amino Acid having role in sleep wake cycle:TryptophanPhenylalanineGlycineGlutamine  <response>: TRYPTOPHAN METABOLISM USE IN - 1Serotonin, melatonin synthesis Fig:- Synthesis of serotonin and melatonin Use of serotonin - neurotransmitter responsible for mood elevation, git motility, temp. regulation Excretory end product - 5 hydroxy indole acetic acid increase in urine in carcinoid syndrome Melatonin synthesized in pineal gland Responsible for biological rhythm in body 