I can be sleeping very well and if I move just right my lower back feels like it is just locking up on me. Most of hte time it is just the right sode but once in awhile it will be the left or the worst is when both sides do it at the same time. Usually if I can get myself moved into a different position, it will go away. It always wakes my husband because I can't get our ot that position without practically screaming. Anyone else have anything like this happen.....I have talked about this before and people have mentioned muscle spasms but I am just not sure. What do you think?? Thanks ~hugs~Mick!!