This happened just the other night....Not really what I'd call a nightmare, but definitely not pleasant. I went to sleep watching Seinfeld.....It was the episode where George didn't want anyone to know his ATM passcode. On the show, it ends with a guy in a fire screaming "GIVE ME YOUR CODE" because for some reason he needed george's card to open the atm he was trapped in...It's stupid. Anyway, my brain didn't end the episode there when the show did....Instead, it created an extended version where George never gave him the code and the dude burned alive.
I always sleep with my TV on and It usually some sitcom, or animated series that's not too....explosive?...I guess....Something like Shin Chan or Sponge Bob.....Still, it manifests in weird ways.