So I took a nap earlier on the couch. It was probably a good three hour nap. After an hour or so of sleeping, I felt myself starting to wake up. Instead of opening my eyes and moving my body, I said to myself 'hey, I think I should try lucid dreaming right now, remember, i'm aware of everything'. A few seconds after I said this, I felt myself slipping into sleep...and my eyes were going crazy in my head. My vision was starting to get pitch black, and all of a sudden my body jumped up. I was scared and stayed up for a few minutes, before going back to sleep, without being lucid.

Is your body suppose to jump up when you're about to be lucid? .__. My eyes felt so weird, and it was scary. Is this normal? Was I about to black out?
Thanks.