Every night around 1:00AM to 5:00AM, whenever I go to the restroom across from my computer room/office, I always hear a knock coming from down the hall, and i'm not sure what it is. Some day I will get enough balls to knock back. To be even creepier, there is an antique porcelain doll that stands about 3 feet tall that is facing the corner directly next to my bed, and my bedroom is down the hall. My friends say it might be the doll banging its head against the wall.