I'm actually running a campaign that uses a lot of dream mythology. It's at my
blog.
That said, I have night terrors. I've had night terrors since I was four. My dreams are the battleground for my psyche. You wouldn't
want to see anything I dream about come into the real world. Actually, you might have if you've read any of my articles. My dreams are typical fodder for inspiration for them.
The last dream I had with a monster in it involved something that looked like a spider the size of large dog with the head of a shark and bat-like ears. After chasing me through the house it managed to throw me out a window and then eat me. At which point I woke up screaming.