S_T & Jimbo are right on about core & hamstrings issues. Good advice there. I had back surgery about 20 yrs ago. Good news is your discs dry up and shrink in time,,,like grapes turning into raisins. So pressures can fade over the years. My aches fade during the canoe racing season when my core muscles are in the best shape. Still have tight hamstrings, hate to stretch, my bad.
Another thing that helps me is using pillows for good support while sleeping. While on my side, I use some between my thighs. It keeps the hips from twisting my back. While sleeping on my back, I slide the pillows under my backside about where a wallet would be. You should feel a light stretch to your back as you slide off. Kind of like you tilted a recliner back too max.
Most chiropractors will have pictures in their offices showing the right way to support yourself while you sleep. A stuff sack full of extra clothes works while camping. If you're lucky you find a nice "hip hole".
Good luck and hope this helps. You kind of have to find what works for you.
Jim