I tried it over the weekend and… it may have helped? 
I slept ok, certainly no miracles, but it was also under unusual circumstances (out of town this weekend) so the fact that I slept even ok is pretty good for me. I will continue for now and see how things progress.
My experience with Melatonin is that it makes me feel a bit sleepy in a 10-20 minute window after taking it. If I don’t fall asleep in that time period, I’ll probably be up for the long haul. The other part of my experience with it is that, after sleeping really well for 4-5 hours. I will come wide awake again for an hour before falling back asleep for another 1/2 to 2 hours.
I took it for several years but discovered diminishing returns on the effect when I went into depression so I stopped. The antidepressants I eventually went on made up for it. I’m all good now and I just count myself lucky.