I take 10 mg every night, but I also use cbd oil..even with no thc, it can help.

Melatonin & I have a mixed relationship. I finally gave up melatonin for Medical Cannabis to help w sleep.
I now sleep 7 or 8 hours , fresh the next morning.
Granted I feel less fatigued but MS "allows" me to sleep 7 or 8 hours even if its 9 p.m. to now 3:30 a.m.

Thanks to all contributors

I take both melatonin and sleep aides along with my gabapentin at bed time

I take the lowest dose of melatonin coz Doc Oz said take a low dose and you won't feel so tired in the morning. He said you can make your own work by doing a nightly routine of starting to get ready for bed an hour or so before bed. That triggers your own melatonin to start working. It works for me.