Once, I actually had a wet dream and I remembered my dream. I was being fucked by a transsexual. Which is really weird because I'm not particularly turned on by transsexuals, I see them as women and not men and considering myself 100% straight, it's so weird that the person in my dream got me to cum. I'd really like to have a chat with my subconscience.
I usually masturbate to put myself to sleep. If I masturbate and don't cum but fall asleep instead I'll wake up with a wet dream.