I get these cramps too, lately they have been coming everynight, sometimes on both legs - all i have to do is move slightly and i just cramp up. The other night my left calf started cramping - it stopped for a second i went to move my leg to stretch it out and it cramped up again it lasted ages and i was in so much pain i was almost in tears! I've heard that drinking milk can help - i've started buying the boost milk with extra calcium to see if that helps.