Melatonin regulates the sleep cycle, helping you to fall asleep more quickly and improving certain aspects of sleep quality. Melatonin, naturally produced by the body, helps regulate our circadian rhythm, including the sleep cycle. It is secreted by the pineal gland as soon as night falls, when light fades, to signal to the body that it will soon be time to sleep. Once the melatonin peak is reached at around 2:00 - 3:00 a.m., the quantity of melatonin secreted decreases to indicate to the body that it's nearly time to wake up. Each individual naturally secretes a different quantity of melatonin. So it's vital to find the right melatonin dosage for you, as each individual's needs may be different. Dosage is crucial, as too high a dose of melatonin can have the opposite effect, preventing you from falling asleep. It is advisable to start with the lowest dose and gradually increase until you find the one that suits you best.