Sleep is a more active process than you may think. It’s a time for the brain—as well as the rest of the body—to recover, grow, and develop. Sleep disturbances can lead to poor sleep quality and ultimately accelerated aging of your organs, including the brain. With one in three Americans suffering from sleep related problems, many people are supplementing with melatonin—a hormone naturally produced by the tiny pineal gland in the brain to induce and sustain sleep—to get that much-needed shuteye. But is it a safe sleep aid if used every night?