muscle spasm
"Treatment for Restless Legs Syndrome - I was recently diagnosed with RLS (a condition I thought to be psychosomatic until I got it - it's real!) I thought my wife and I were going to have to sleep in separate beds due to my tossing, turning, stretching, etc. to get relief.  From the first dose of Skelaxin the problem was eliminated.  It's a wonder-drug in my personal opinion."