How does everyone feel about giving melatonin to a child? I know they have children’s melatonin and…

How does everyone feel about giving melatonin to a child? I know they have children’s melatonin and I’m debating on whether on not I should get some. My almost 4 year old has such a hard time sleeping. He cut his nap awhile ago, so he never naps. And he would honestly stay up all night if I let him. I feel like he’s never tired. I put him to bed around 9:00 and he’s up every hour or 2 after that. I’ve tried changing up the times I put him to bed, earlier and later, and nothing has worked. It’s not night terrors because he’s not waking up crying or screaming. And even when he has a super active day he still doesn’t sleep through the night. I just don’t know what to do anymore...