Your brain produces melatonin, a natural hormone, to help support healthy sleep-wake cycles.* It promotes a state of peaceful wakefulness* hours before your bedtime, so you can fall asleep and stay asleep.
Melatonin levels increase in the evening as it gets dark out, helping you feel more relaxed before bed. Inversely, levels drop in the morning when it is light out. There are a number of factors that can disrupt melatonin production, including screen time before bed, jet lag or an altered schedule requiring you to get to bed earlier. Your body also produces less of it as you get older.