What are the methods to get instant relief from Neck Spasms?

Last week my neck was so sore I couldn't turn my head to the left at all. This had been going on for several weeks and getting worse every day. We drove 150 miles to visit my bro-in-law and it was torture. It was hurting so bad I went to bed early. The next morning my neck was like new, no pain at all. When we got home I removed the 6" memory foam mattress topper from our bed and my neck has been fine ever since. So I would suggest trying a different pillow or bed if you can.