Why have I been having bad dreams?

Okay, so I've constantly been having bad dreams about this demon that for some reason gives away free money to children, and I know that it's not bad when you think, oh free money! ...but he apparently tempts people by letting them find money and after awhile he will make one of those people do somthing terrible, he also has golden eyes when he turns his head, its creepy!!! but they also all have a certain letter on their head, like from the alphabet for some reason, but the one I remember the most is the one that had the letter "o" across his forehead. It wasreally creepy and I cant explain it, I woke up shaking that morning. But any way why am I having these dreams? what causes them? :o