Having trouble sleeping and getting into a good routine? Are you traveling to a different time zone and you want to get your body into the right sleep patterns? Consider taking a melatonin supplement to help. It's non-habit forming and safe. Melatonin, a natural substance secreted by the pineal gland, plays a critical role in our sleep-wake cycle. Melatonin production in the body declines with age, so supplementing can be a great way to restore optimal levels and prevent sleep disturbances.