SP was scary for me too. I always thought I was on the brink of dying so I'd struggle to move again. Once in a great while I'd be able to calm myself and simply re enter the dream I'd just been having or even create a new dream to slip into. The more I did this the less frightening SP became. I never did adjust to it, it was always a bit scary on some level but I came to learn to control most of the fear and utilize the SP.

Good luck with your post SP dreams.