I often get cramp in bed - calves and feet, though it usually kicks in just as I'm waking up rather than when I'm actually asleep. I'm training myself not to stretch as I wake! It doesn't make a difference whether or how much I've been running, it's just random. Recently I've got sometimes got twinges even when just moving around the house, again often when stretching for some reason. Good hydration does seem to help but it's not the whole story - plenty of cramp when well hydrated. I've read that magnesium deficiency can contribute to cramp so I now try to keep up a good level and it has helped but not entirely resolved the problem. From what I've read, the experts say there's no single factor (and therefore no silver bullet) but a combination.
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