I have bad sleep paralisis (and spelling!). Basically most of the time when I wake up I will see or hear things that arent there for about a minute or two. Usually I see bugs (spiders, swarms of ants or flies, etc) or I'll hear a loud screeching noise. One night though, it took an extremely strange turn. I woke up and heard someone typing on my computer, then they stopped, and pushed out on their chair. I peeked open my eyes and saw my mom standing beside my bed. Right as I was thinking "what are you doing here, mom?" An extremely odd hissy voice whispered in my ear "You thought that was your mom? How silly!" And then my "mom" disappeared and the screeching I normally hear began. It was just so strange and elaborate from my usual hallucinations. Ive never had anything like it before or after.