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Light suppresses melatonin synthesis. The primary use of melatonin as a supplement is to normalize abnormal sleep patterns.
Irregular sleep patterns are associated with a wide variety of health problems and premature aging. Melatonin is the hormone used by your body to help you fall asleep, and thus supplementation is seen as a way to get regular sleep. This is particularly useful for people who engage in shift work or are jet lagged.
Other benefits of melatonin include general neuroprotective effects, as melatonin is a powerful antioxidant. Melatonin also has several anti-cancer properties, and is currently being investigated for its role in fighting breast cancer. It does not appear to have much of an effect on lean mass or body fat, but it potentially stops your body from gaining more fat. Melatonin supplementation also benefits eye health, possibly reduces tinnitus, and improve mood (by helping you get better sleep).