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. Natrol Melatonin is a nighttime sleep aid that assists with occasional sleeplessness. It helps to establish normal sleep patterns to give you a more restful, relaxing sleep and in turn, better overall health. Natrol Advanced Sleep Melatonin is a 2-layer controlled release tablet that releases and an initial 5mg dosage to help you fall asleep fast, and then releases the remaining 5mg over time to help you stay asleep through the night. 100% drug-free, non-habit forming, 100% vegetarian.