Melatonin, a hormone made by the pineal gland of the brain, helps regulate your sleep and wake cycles. Natrol® Advanced Sleep Melatonin is a nighttime sleep aid that assists with occasional sleeplessness, while also working to help reduce overall anxiety. It helps to establish normal sleep patterns to give you a more restful, relaxing sleep and in turn, better overall health by promoting a healthy immune system. Adequate sleep is essential to overall health and performance, and plays a role in the ability to learn, create memories, solve problems and maintain a healthy mental outlook. By contrast, researchers have found that lack of sleep can result in mood swings and an inability to focus and respond quickly.