Natrol® Melatonin products are 100% drug free, non-habit forming, help you have a better night's sleep and wake up feeling refreshed.† Melatonin is a hormone naturally produced in our bodies as it gets dark and serves as our body’s biological clock, helping to manage sleep and wake cycles. Aging, stress levels, diet, exercise and even exposure to electronics can affect our bodies’ ability to produce melatonin.