Hi, I am 36 years old and have had back problems for the past 13-15 years, but not your usual pain during the day when Im active, but when I go to sleep, about 3 hours into sleep, I feel like my muscles along side my spine tense up. Sometimes to a point that my kids literally have to step on my back, just so I can get out of bed, stretch and get on with my day. As long as I am moving around and active, I am fine. Lately I have notice that if I have a pop (pepsi), the pain is excruciating. I usually only have a couple cans of pop a week. (used to be a popaholic) Does pepsi have anything that would cause this pain in my muscles?