its already well known but thought i would post it for ppl who dont know it yet.
if you put a bar of ivory soap under the sheets near your legs while you sleep, it will stop your jimmy legs.
my bf gets them only when he is really tired. the more tired he gets the more they shake, the more they shake, the less sleep he gets. we were in a vicious circle a week ago, i couldnt get any sleep he would jimmy so much. finally on the 4th night i put a soap under the sheet and that night, not one jimmy.
its really amazing. if you havent tried it yet, do it. you have nothing to loose and alot of ppl have confirmed this works.