Nightmare with my ex-

This dream started out with me being in my grandparents home in the living room where on one side of the room is a fireplace and off to the side is where a TV was but that was now where me and a girl were sleeping in separate sleeping bags. She had her back to me the whole time and I could just see her mess of black or brown hair sticking out of the sleeping bag at the top. The room was smoky or hazy, I couldn't tell which but all the lights were out and I could just make out everything in the dark. There was no fire in the fireplace. Outside in the distance, I could hear a kind of howling that echoed strangely and for some reason or another I knew it what it was as flashes of it would appear in my mind (in the dream). It was a horrible demon perched on top of a hill apparently waiting for me to come out of the house. As that was going on in my mind, I heard these footsteps on the floor that sounded like something was speeded up and moving across the floor, back and forth to the door. I sat up and the girl was still with her back to me, but now the door was open and a window also that was next to the door was open. The howling sound was louder and a cold wind was pouring into the room. I got up and closed the door and window and then laid back down taking one last look at the girl. Before long, I heard the footsteps again and I peeked over the edge of the sleeping bag to see if it was her opening the door and window. I just saw the back of her hopping into the sleeping bag but it was like she was moving in fast motion and I noticed her head was moving like she was laughing. The sound outside seemed to be getting closer and more strange as it seemed that it was coming from all directions. The howling sound now was followed with a cackling at the end. I got up once more and this time stomped over to the door and slammed it shut and then shut the window with equal force. When I got back to my sleeping bag, I reached over and shoved the girl in the other sleeping bag and said, "Hey! Stop doing that! If you open it again, I'm going to throw you outside to that thing!" Just at that moment, the girl twisted her head around and her face was pale and bloated but I could tell it was my ex-. At that time, I yelled (maybe in and out of the dream) and the yell echoed in my head until woke up.

I couldn't go back to sleep after that even with the light on. I don't know what freaked me out more, the whole situation I was in in the dream or being that close to my ex-. LOL!