Melatonin is a hormone that is naturally produced in the body. Melatonin is closely involved in the natural sleep cycle. Because inefficient sleep can affect your energy and your mood, melatonin is a terrific choice if you experience occasional sleeplessness or jet lag, or if you want to improve your quality of rest. Melatonin helps you fall asleep faster and stay asleep longer. When taken at bed time, melatonin may provide blood pressure support for blood pressure already within a normal range. Melatonin’s effects on blood pressure may help support restful sleep and a relaxed mood.