Leg Cramps

I keep having leg cramps for the past few nights while sleeping. I read up from some article that it is due to the weight of my uterus which restrict blood flow and compress nerves in my legs. The pain may also signal a calcium deficiency. Can't tahan the pain at first but now use to it, so when it occur I know how to handle it, I will flex my feet (pull toes toward knee) to stretch the calf muscle. Massage the muscle with long, firm strokes toward feet. Thanks to 'mybaby' magazine for the great info :)