You're not alone. I have a lot of trans' related dreams too. It's from good dreams to the worst nightmares.
Usually I'm a guy in my dreams. But in some nightmares I turned into a girl. In one of my nightmares, I and a couple of friends went to the mall. While talking with my friends, my boobs suddenly growth very very big. When I wake up, they were still there. I had also some good dreams. Once time I got enough money for top surgery and I was happy for that! But unfortunate the dream wasn't real. :/