Hey.. this probably isn't a ton of help, but I am very prone to nightmares. Right now I'm trying an AD to see if they help them, but my doctor also told me about a high blood pressure medication that will also get rid of nightmares. If you really have a problem with them, maybe you can ask your doctor about that?

For me, I can try all that relaxing stuff and have a good day, be reasonably happy, etc. and I still have nightmares 3-5 times a week.

After particularly bad nightmares, I put on a really funny movie, and try to fall back asleep to that or else I'll just imagine the nightmare in my head all night.