muscle spasm
"I have suffered with back pain and muscle spasms for almost ten years.  Sleeping through the night only happened in my dreams.  Travel was limited by the necessity to stop frequently, get out and walk/stretch.  A 200 mile trip could take 6 hours.  Hotel beds were excruciating.  After three weeks of routine dosing,  my dreams are now a reality.  Sleeping thru the night, driving for extended periods and staying away from home overnight have given me my life back.  One word of caution, with your doctor's guidance, start with a small dose and be patient as the dose is increased.  Beginning large may cause extreme sleepiness.  Yep, the voice of experience.  Fell asleep in mid sentence!"