Have you ever tried anything with PhGABA in it? The known good source I have found is Biotest's Z-12. From the experience of others using Melatonin will only last so long before it too stops having a noticeable effect. I used Z-12 for a year and it pretty much resolved my issues and now I can sleep 99 percent of the time just as well as when I used to take it...it must have helped reset some Circadian rhythm of some sort because I don't need it anymore to go to sleep or get a good nights sleep.