How to Overcome Traumatic Nightmares?

I've been dealing with this for a very long time. I definitely would say I have chronic nightmares that are due to trauma. The things that help me the most are meditation before bed and I realize that some of my medication actually causes nightmares so I stopped taking those. But yeah I definitely recommend for preventative measures to use a meditation before bed my favorite is "the honest guys" on YouTube.. if you just had the nightmare I recommend giving yourself reassurance and thinking about how the dream should have gone in a better way. That's what they recommend military people do for their nightmares. I also use cannabis after if my nightmare is bad enough.

Personally, I was given advice that in my nightmares I had to address the person responsible for the evilness in my dreams. It was hard for me at 1st...took me a long time. But it works! And the traumatic events that happened I have to use grounding statements as soon as I wake up or if I get flashbacks...like I'm okay, I'm not hurt, I see white walls, blue carpet, or whatever I see by looking around the room, I smell.... i hear.... etc etc.

The only thing I know of is working on processing your trauma in therapy... If you can't do that or just need something temporary while you're doing the work, (this isn't a proven method by any means) but I used to put on audio books or meditation podcasts to sleep with in hopes it would keep my brain occupied while I slept. It won't solve the root problem though.