I don't know how to really explain this one, but here goes. When I was younger I used to have these repeating dreams. Always the same thing, I'd be in my room, float to the top corner, through the roof and end up in my roof. I was always talking to the same thing. I have no idea what it was but I knew it wasn't good. I got this odd feeling from it, like it was just evil.
The dreams started to change, in some of these dreams I would dream of something playing on the radio. As it got louder and closer I knew "it-or" as I called it, was coming closer to me. As a child I'd rock myself to sleep. I felt it was the only defense against this and it seemed to work.
I had one very odd dream where I was in my brother's room, looking through his window at myself. It wasn't my reflection but was a solid thing standing there looking back. It looked cold, almost like it had nothing inside.
The last dream I had of this I was taking to myself on top of a cliff face. It was a triangle shape cliff with rocks all around me, I looked down the cliff side and could see my family in a car. They were driving along side the cliff. This thing asked me to push a boulder onto my family to kill them. I refused and I haven't had a dream like it since.
Now, here comes the strange part (if it wasn't already strange enough). Our family went on holiday for Christmas one year and my sister was walking along a beach, when a little girl came up to her and started to talking to her, at a point in this conversation the girl told my sister that "it-or" had visited her the night before in a similar fashion to how it visited me.
When my sister told me the my neck hairs stood up on end.
I have experienced and heard of similar things.