Someone at prenatal yoga, this evening, said that she thinks that bananas actually cause them for her.... bizzare but true
A few other things that can cause them:
- dehydration.
- either drinking too much water and/or not having enough salt in your diet (if you are very hydrated, then your blood becomes too dillute). This is common for athletes (i.e. some drink a lot of water, to stay hydrated, and don't replace the electrolytes)
There are other causes too, but those are the most common. So keep hydrated, but try not to over-hydrate and try to ensure that you have enough sodium in your diet.
ANother thing that my prenatal yoga teacher suggested were gentle "standing calf stretches" before bed (see
http://www.foot-ankle.co.uk/content/...lestendonitis/). Keep it fairly gentle - since over-exerting can cause it to counter-cramp.
Best thing you can do if/when you get a calf cramp is to get out of bed and walk around on it - will hopefully loosen it up (despite being a little odd in the middle of the night...).
Hope it helps.
QT