interseting fact

I see people/things in my sleep. The reason I know this is one night a friend of mine was spending the night and we were sleeping, when all of a sudden I sat up and pointed to the other side of the room and asked who that was. My friend said that he didn't know what did I see? I told him I saw a person sitting in my chair and that they weren't welcome in my house. Right after that I fell back asleep as fast as I sat up. When I was told in the morning what I saw I didn't remember a thing and apparently this has happened more then once.