Maternal ASMR. I had vivid night terrors for two years and not even medicine and therapy did anything. I did find that ASMR specifically maternal stuff like mom tucks you in or mom takes care of you when sick tend to keep them away. I still got them but over time they became less frequent and I've gone a full year without a single night terror or nightmare. I hope it helps and this stops for you.

I used to have the same issue, vivid nightmares unrelated to trauma or phobias. my PCP prescribed an anti-anxiety medication that also helped me fall asleep, and it almost completely stopped the nightmares. sadly I don't remember the name of the med, since it was ~3 years ago, but I would talk to your PCP or another doctor about trying to find one if you think it'd help!

I experience constant nightmares whilst mine are often trauma focused I figured these might help you too... I have fairy lights and fake candles that flicker softly, it's a soft enough light to be able to sleep but still calming enough to escape the darkness, another option is touch sensory things such as a really soft fluffy pillow or blanket that you can just have next to you in bed and touch whilst sleeping, or cuddle a large stress ball squishy - you can get scented ones and that can help relax you too. It may not stop the nightmares but it might help reduce them. My therapist has been helping me with my sleep for a while and the key thing is the safer you feel when you're sleeping the easier it is for your body to rest and go to a deep sleep which usually results in either not dreaming or not remembering them when you wake because of the depth of sleep. So use as many things as possible to feel as calm and safe as possible when you go to sleep and hopefully it will help. Good luck I hope you manage to rest better soon