muscle spasm
"So I recently slept wrong and thought I had a stiff neck that it would go away. I was wrong 3 days later it got worst and worst that I couldn't move my head down or to the right or upward. I was prescribe 10mg  twice a day but I just took it once a day with naproxen an anti inflammatory. Plus rubbed vicks on the area which my puerto rican mother swears it works wonders lol. 
Yes it makes u super sleepy but it was a great sleep no complaints. And in 24hrs and 48hrs later. I can do my pt exercises without pain and I feel great about 70% improvement. I still have to continue to stretch and massage the area. This is helping. Everyone responds differently though."