The one way that I used to get out of SP is this: I often find that during SP, there is one part of my body that I can always move, no matter what. It's my big toe on my left foot. I can ALWAYS wiggle that toe, no matter how far into it I am. If I want to get out, I start moving it and eventually I can feel the SP slowly leaving my body. It kind of trickles up through my legs all the way to my neck, where it stops. I am then out of it and able to move.