Melatonin waa hormoon ay soo dayso qanjidhada pineal ee maskaxda ee naasleyda iyo dadka.Sababtoo ah waxay samayn kartaa unugyada soo saara iftiinka melanin, markaa magaca melatonin, oo sidoo kale loo yaqaan hormoonka pineal, melatonin, melatonin.Ka dib markii melatonin la soo saaro oo lagu kaydiyo jidhka pineal, dareenka dareenka dareenka ayaa kicisa unugyada pineal si ay u sii daayaan melatonin.Dheecaanka melatonin waxa uu leeyahay laxanka wareega oo cad, kaas oo la xakameeyo maalintii iyo firfircoonida habeenkii.Melatonin waxay joojin kartaa dhidibka hypothalamic-pituitary-gonadadal, waxay yaraynaysaa maadada gonadotropin hormoonka sii daaya, gonadotropin, hoormoonka luteining iyo hoormoonka kicinta follicle, waxayna si toos ah u dhaqmi kartaa gonads-ka si loo yareeyo nuxurka androgen, estrogen iyo progesterone.