https://en.wikipedia.org/wiki/Melatonin
Fairly concise info there.
I have some 5mg time release pills I take from time to time when I’m antsy or just can’t seem to turn my brain off.
Thanks. I have a 5 and 10mg here as well. I have insomnia issues do my dr encouraged me to use it. I really should have given it a chance. I understand how it works. It’s just not going to work unless I do my part - ie shutting off the tv, electronics, lights etc.