coincidentally i have been having severe cramps in my calves, both legs but not at same time, also right before waking up in the morning, well late morning since i havent been going to bed before 4 am this past week. The worst ones are the ones that come on while you are sleeping and it becomes part of the dream and by the time you wake up the cramp has been going on for a while and those are the ones that remain sore for days for me. i have had intermittant period of severe cramps over the last five years. I drink more, eat bananas and take extra magnesium and they abate. coulod it be the weather we have been having here on the east coast in december? cold and of course the snow recently.