Melatonin is a hormone that helps you fall asleep or stay asleep. It is produced in the brain and can be bought over the counter. Some people think that it helps them sleep better, while others think that it makes them drowsy. This hormone is made by the pineal gland and is released at night. It helps regulate both the sleep and wake cycle. The bright light from our TVs and computers at night can disrupt this natural rhythm. When you take melatonin, it will help you get to sleep or stay asleep.