I was awakened in the middle of the night by a large cracking sound in my neck. I think I moved a certain way. it was a terrible sound, not just a pop., but a huge crack sound. Afterwards, I felt very of and was uncomfortable, but not in pain. I took 1 xstrength Tylenol and went back to sleep, but had a difficult time getting comfortabl. this morning my upper back feels very stiff and sore. I have had upper back issues in the fast, but have been fine for years. I am 57. Couod it be serious, or is it just one of those things?