I've been getting cramps in my feet and legs (only) for quite a few years. It happens when I wake up in the morning, no other time. I found a way to stop them in their tracks! I sleep under a duvet (only) and when I feel a cramp coming on, I bunch up the duvet and rest my foot on it and the cramp stops! I haven't had a full-blown cramp in years. I know this sounds silly but I think it relaxes the muscles that want to cramp.