@cardigan
There is a product called Theraworx that I use on muscle cramps in my calf area. The cramps would wake me from a dead sleep, I had to get out of bed quickly in order to get my feet flat on the floor and stop the cramping. Theraworx is a foam, that you apply to the muscle that is cramping. The cramps were so strong that I felt soreness the next day. And I agree with the previous post about dehydration contributing to muscle cramps.