I was wondering if someone could clarify why the lower back can be painful in the early morning hours before rising. I read something years ago about klebsiella in the gut causing inflammation to the lower back. For me, the pain varies and sometimes is almost non existent. I have been having those symptoms for years. Was wondering if by sleeping more elevated would help symptoms since back pain doesn't happen during the day while in an upright position.

AS symptoms on and off since 2003. Mostly mild symptoms. No diagnosis.
HLA B27 negative