HI, I have been waking up with cramp (along with the rest of the nation) for years now, jumping out of bed and rubbing my legs etc when i suddenly remembered the treatment applied to footballers when they collapse in a football match. If you watch them while they are sitting down the physio pushes their foot towards their head, with the physio`s hand pushing just under the toe end of the foot and this brings relief.
Now then....when you wake up with cramp you have to immediately `pull` your toes towards your head while keeping your legs flat and your cramp will go.
I have used this method for some years now and it works, not just for me but everyone else i have told (including my skeptical wife) good luck and please pass this tip on to others.
When you `pull` up your toes towards your head you do not need to use your hands, just use your leg muscles to pull your toes back good luck!