Naveenedin
The symptoms at night and history were suggestive of neural hypoxia. I would expect to find some positive neural compliance test, but certainly some loss of movement and altered movement control in the pelvis/lumbar region.
If compiance testing was negative I would still treat the movement dysfunction in the spine and monitor the night symptoms.
Eight years with this problem is not unusual and I see many people with symptoms for 20 years plus and they have often compensated for the original problem by changing movement paterns. This is then reinforced by health professional frightening them by telling them they have 'degenerative' changes in their spine!
Steve
Hallamshire Physiotherapy