I was prescribed melatonin when I was 11. In the UK it is only available via prescription (source on that: https://www.simpleonlinepharmacy.co.uk/health-advice/sleep/melatonin/why-is-melatonin-banned-in-the-uk/#article )
My sleep schedule was haywire (hormones + emerging gender dysphoria did not help) but melatonin really helped me. I also think it helped my anxiety a bit? I’m not sure if that was just bc I was sleeping better but I have terrible social anxiety and it seemed to take the edge off it. anyone else? :)
Some things that haven’t really been mentioned yet: Melatonin helps me to fall asleep very well, but in turn I sleep less overall. Without melatonin I sleep a good 8 hours if I actually fall asleep, with it I wake up after 6 and rarely fall back asleep. And secondly, melatonin makes my dreams a lot more intense and vivid. Maybe it has to do with the shortened sleep and how the sleep phases fall, but it’s an effect that I have consistently witnessed for me.