I had a scary dream about demonic possession!?

So, I've actually had night terrors since I was a child. At some points in my life they've been more sever and frequent than others, but I've never had a dream like this. Last night, I dreamed that I was the nanny/tutor/mentor to 2 little girls that were sisters. There grandmother was the guardian. Anyways, so, turns out one of the little girls becomes possessed. What ever is possessing her is good because when I get someone from the church to come by to evaluate and determine if an exorcism is necissary, the child acts 100% normal. In my dream,(and prepare yourself, this is weird) but the way that I know she's possessed, is ofcourse her pupils dialate completly and she's always naked when she's possessed. I'm not sure what the dream means. Another thing, in my dream the grandmother was actually my step grandmother. In the dream we had no relation, but in reality, that's who it is. I thought it was odd, cause she actually used to take care of me and my sister a lot when we were younger. Everytime I'd wake up from this dream, I'd go back to sleep and it would just pick up where it left off. At the begginning of the dream, the little girl was the only one that was possessed but right before waking up for good to go to work, the grandmother started talking in a low scratchy voice using a lot of profanity. It started because, I told her I didn't know what to do and that I couldn't get anyone to do an exorcism and that I felt like my being there was making matters worst because the child seemed to act out the most when I was present. At first the grandmother begged me to not go that she couldn't do it alone. Then she began yelling, "F**K IT. Just F**k it. Let them have her." But she was saying it in this really scary voice. I don't know what this dream means. I've been a little shooken up from it all morning. Anybody have any insight at all let me know. I'm open to all opinions and theories. Oh one more thing, I don't go to church regulary, however, I do pray regulary and I am a firm believer in god.