I've had them horribly this time round. 5-10 times a night I've been hopping round he bedroom in agony with cramps in feet, calves, thighs and occasionally shins - that one's a shocker. Finally got organized and got some magnesium and it has been MAGIC. If I forget to take the supp, I'm guaranteed to get cramps, if I remember, nothing at all or maybe the occasional twinge. That said, I've heard it doesn't work for everyone as it depends what's triggering them. May also be dehydration, insufficient salt or other things. Well worth a try though.