Melatonin provides relief for occasional sleeplessness, and helps promote a more relaxing night and better overall health. Its production increases in response to darkness, promoting sleepiness, and decreases with exposure to light, aiding in wakefulness. Melatonin is a hormone naturally produced by the pineal gland in the brain, primarily responsible for regulating the sleep wake cycle. It is commonly used as a dietary supplement to treat sleep disorders, jet lag, and insomnia. Product Benefits. Supports Sleep Cycle. Reduces Anxiety Before Surgery. Antioxidant Properties.