My most successful therapy work over the past 40 years has been Jungian-based, meaning out of Carl Jung's approach that involves dream work. This says a nightmare or any dream repeats until you "get it"--Get the message your subconscious is trying to remind youth at you already know and need to remember, start employing.

Once you understand this repeating dream so that you can use it in life, you won't have it again.
this worked for me recently after a bad experience at work had me unsure I even could return. I had nightmares, anxiety attracts. My T, who didn't believe in dream work, did missed my nightmares & I was a wreck.

Finally I tracked down the old dream leader. She made meat aware that I was still going to a part time library job and fight for the college students as I had done when I was a professor. I'm no longer a professor--but every time I acted as if I were, I cause myself all sorts of woes. I could have lost my job, been sued, lost retirement benefits ... all because I was fighting a fight that was no longer mine. The dream made it so clear!! And I got it, the clear way she explained. It.

Dreams never give up trying to get your attention, and once you learn their language, their message, that is pretty clear.