muscle spasm
"I am taking Tizanidine for muscle spasms associated with 3 ruptured discs in my lower back, sciatica and spinal stenosis. So far it only helps me sleep a few hours at a time, maybe 4. If the pain is really severe during the day I take 2mg. I find if I take 4 mg. It makes me sleepy. It does seem to help me but only for a short period of time."