About ten years ago I had a friend stay with us for a short time, well one night he was on the phone to his girlfriend while I was sitting in a chair facing the door to the hall. I saw a tall, about 6 foot, jet black figure walk past the door. I thought it was my then husband going to the bathroom. I got up and looked and he was still asleep in bed and no one was in the loo. It was like someone had cut a person out of black paper while still having it walk like a real person.
About four years later something similar happened. It was about eleven at night and I couldn't sleep because it was so hot and humid so was doing odd chores to tire myself out. As I went to walk into the hall I saw something which I can only discribe as a figure which appeared to be an outline made up of a white line. It looked like someone had been outlined in tape. It was walking towards the bedroom and my first thought was that someone had got into the flat so I searched the place and there wasn't anyone there but me. To say it freaked me out was an under statement.
Yesterday I couldn't sleep and was sitting at the computer. It was about 2am and I was wide awake. Out of the corner of my eye I was aware of a dark figure standing in the hallway, it didn't have a clear edge to it and I was convinced that it was me just seeing things, but the odd thing was that I could feel that there was someone there and kept looking up into the hall. After about ten or so minutes of this the figure seemed to have moved from the hall to right next to me. Again it was a shadow but this time it was generating coldness. I was convinced that I was seeing things but it didn't go away even when I turned my head to look at 'it'. After a short period of time it moved to behind me and cast a shadow over the area I was sitting in. It's hard to explain but was like someone was standing over me, between the main light and myself. I was totally convinced that someone was there and kept turning around to look but it would have been impossible for someone to get past me without me seeing them. After ten minutes or so it lifted and the shadow over me just vanished. I was spooked but not freaked out.