Why do you think I dream I'm?

Harry Potter all the time.... I've read all the books and am a big fan, but I haven't read anything or even thought about harry potter in several months and then all of the sudden I'm dreaming I'm harry potter. And I always dream I'm doing spells and I'm always saying gibberish words that don't mean anything. I have some intense "battles" going on sometimes. Once I was in the middle of dueling someone and a stampede of horses came out of no where and killed me. I feel kinda sinful having these dreams.