I used to wake up like that with very severe abdominal cramp. I believe it is a form of spasticity affecting the muscles there. I wrote a long post about this a year or so ago, but I just wanted to reiterate it in a brief form. I don't have this problem any more. Maybe I get enough minerals now, although I haven't used the Himalayan salt. I will try it. My nighttime horror now is my legs and back jerking, and itching all over. The itching is not from MS--it is from Polycythemia Vera, a common symptom and chief complaint. I use ginger tea if I have to get up with the itch, and that helps. I must get enough magnesium and calcium during the day to stop the leg and back jerks, which is usually successful. I have no way to really get a handle on the itch, although ginger helps. Obviously skin balm helps but does not stop it. I am always grateful when I have a night a sleep through, maybe a third of the time.