I dreamed that in the last year myself too. I had several of them attack me. It generally means they seem to want to attack you spiritually for the progress you are making. I noticed I had that when I was about to overcome an upcoming problem. They have the ability to predict when some problem or two to come would be hard on you from my experience. The only difference is that I had several of them laugh at me, too. Thankfully, I haven't had them lately. I think attending mass or participating in worship with others would help to dispel a demon dream. I thought I would put it out there. Hope this helps. It can be also caused by too much caffeine, squash, or spicy food before bed too.