Melatonin is powerful. It isn't recommended to take it regularly. It's a hormone that does quiet a lot more than make you sleepy.
😱😱what else does it do? My mom takes it on the daily
It has a regulatory effect on a bunch of systems in the body. I can't recall the specifics off the top of my head. But, I think the admonishment was that long term use could disregulate your body's production of it, kind of forming a dependancy.