Mayors in two New England towns try to put a stop to the new craze sweeping the land, the scourge of melatonin brownies. Melatonin is called the sleep hormone, as it is a substance produced in the brain that makes people feel drowsy. Individuals are getting concerned over melatonin products being marketed to kids, who should only get very small doses. The proof is here: New England towns looking to ban melatonin brownies.