This is required reading for anybody taking or thinking about taking melatonin:
https://news.ycombinator.com/item?id=17632668
A while ago an article [1] was posted here [2] with focus on its effects on sleep. Might be useful as well.
[1]: https://www.lesswrong.com/posts/E4cKD9iTWHaE7f3AJ/melatonin-... [2]: https://news.ycombinator.com/item?id=17632668
I'll see if I can find the posting. It was a fairly exhaustive article. It was enough for me to give it a try.
EDIT: I think this was it. Looks like it's had a couple of turns here: https://news.ycombinator.com/item?id=17632668
This is required reading for anybody taking or thinking about taking melatonin:
https://news.ycombinator.com/item?id=17632668