Melatonin serves as the body’s biological clock, managing the sleep and wake cycles. Age, everyday stress and diet choices induced by busy lifestyles can take a toll on the body’s production of melatonin. From the #1 drug-free sleep aid brand in America^, Natrol Melatonin is a nighttime sleep aid supplement that assists with occasional sleeplessness. It helps to establish normal sleep patterns so you wake up refreshed.