To be honest I'm not completely sure what category this falls under however a false awakening seems to fit the best. I was around the age of fifteen at the time and sharing a room with my brother. I woke up in the wee hours of the morning due to feeling cold, when I checked the time it was after three am. I then noticed my covers were completely off my bed and in a heap on the floor at the foot of my bed. As I was pulling them up off the floor I noticed out of the corner of my right eye the hallway light was on and some one was up.
I remember thinking to myself, that's odd, who would be up at this hour with the hallway light on? However when I turned to see I realized that the light was not the hallway light, it was far too bright, and who ever was in the doorway did not appear to be human. It was silhouetted solid black with a very bright light behind it. To the best of my description it looked like somebody wearing a sheet over them that extended to the floor around seven feet tall and with a head about the size of my fist.
I stared at it in disbelief and it didn't move or make a sound. I can see its shadow casting over my brother's bed since it was a few feet from the doorway. I turned to my brother and tried to yell at him to wake him up, however no sound could escape my lips, no matter how hard I tried to yell to wake him up I couldn't get anything out. I remember my heart pounding so hard it scared me as I watched it just stand there, it almost reached the top of the doorway and I tried to wake my brother again but to no avail.
I remember nothing after that, it was if I had blacked out. That was my first visitor.