This happened to me just 2 nights ago. After reading the thread about lucid dreaming. I was trying to lucid dream, and I fell asleep, but then in my dream, I "woke up" because I heard some noises (which may have been real), and I thought there was a robber/murderer type person in my room, in the dark. I was freakin out, trying real hard to wake up before he'd stab me in my sleep. Waking up from that state was pretty tough, takes immense concentration. Once you get a little bit of control, you wake up pretty quickly. I woke up lookin around my room for anything unusual, then went to sleep again after I felt everything was OK. I know this isn't true sleep paralysis, where your eyes are open and mind is awake, but body is still asleep. I think it's fun