leg cramps

When you know you probably are not drinking enough water because you are peeing all the time. So you start getting the worst leg cramps in the middle of the night. Just had one of the worst ones in my groin from the top of my leg to midway down my calf. So I know I need a bit more water, and have heard bananas. Any other suggestions? Maybe they will also help with the awful hip pain I've been getting from sleeping on my sides lately.