I'm mostly finding old studies from the 90's. Very few from this decade besides a few involving rodents,
but the findings do look promising. I imagine something like this is very dose dependent which is also
unique to each individual which is why I stay away from Melatonin.

My experiences with Melatonin in the past were poor because how little Melatonin is regulated.
Companies slap on a label, pick a number from 1-60mg, and call it a day.

Unless things have changed and there are sources to verify contents like you can find for supps
like Omega fatty acids from "International Fish Oil Standards" or IFOS which include lab testings...