I keep buckwheat filled heat packs in the freezer. When the cramps come, I put one on the floor by the bed, sit on the edge and knead the pack with my toes. Then dig my heel into it and point toes up toward shin keeping the knee straight.

Because my heels are very sensitive to pressure, there is a small foam pillow at foot of bed upon which I put my calves letting my heels hang off the edge. This forces me to extend the achilles tendon and reduces the calf cramp for me.

If I didn't need the pillow I would have tried the soap.