Natrol® Melatonin products are 100% drug-free, non-habit forming, and 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.