An increasingly popular sleeping aid, Melatonin is a hormone that is naturally produced in the body in response to darkness. Melatonin insufficiency can result in insomnia. When stress sets in, people tend to have a very difficult time falling asleep. Melatonin supplements are a simple solution to combat these effects. It could also treat other sleep related difficulties such as jet lag, anxiety, sleep-wake phase disorders and some sleep disorders in young children. Taking Melatonin after surgery may also be beneficial.