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.**