The science behind melatonin.
Melatonin is a naturally-produced hormone that helps regulate your body’s sleep-wake cycle. At night, your brain starts emitting melatonin, signaling to your body that it’s time for bed, and this continues all night until the sun rises.
If you have low levels of melatonin, this can lead to trouble falling asleep. From exposure to blue light at night (like playing Words with Friends in bed) to a lack of daily exercise—several factors can alter your body’s clock and make it more difficult to sleep at night. The good news is that taking melatonin at night may help you fall asleep while you work on your sleep habits.