The food nutritional supplement melatonin is rather well-known. Some of the nutritional supplements that can help us sleep is melatonin. The body can produce melatonin by itself; our pineal gland is the organ that creates melatonin. The brain also includes various parts including the pineal gland. Light and darkness are responsible for varying the production of melatonin in individuals. During night time, we can expect our bodies to generate massive amounts of melatonin.