Melatonin is a hormone that helps regulate sleep cycles, and its production is affected by exposure to light or darkness. Aging and exposure to artificial light, such as sunlight, computer screens, and city lights, may reduce melatonin production. Supplementing with melatonin can help restore normal, healthy sleep patterns. Melatonin also acts as a neuroprotective molecule and radical scavenger, helping to support a healthy immune system, cardiovascular system, and bones. Plus, it promotes nightly repair, regeneration, and detoxification during sleep.