I was lying down. I've hit SP by accident a lot before. I had actually never even heard of lucid dreaming until I was researching SP one night. But whenever I try to induce SP, it's never as deep as my accidental ones. I just become so relaxed that I have no urge to move and it takes a pretty good amount of will to move my body. When I would have SP by accident, I couldn't move at all no matter what I did. Also, when I try to induce SP, my body goes completely numb. One time, I was so deep into it that I couldn't even remember if I was wearing clothes lol. But I always meditate lying down and I almost always become semi paralyzed.