I'm going to document this for any who might be going through the same thing.
Sleeping is fine but getting comfortable and moving around in the bed is a painful exercise in futility these days. Everything starts fine, I'm comfortable on my left side with a pillow between my legs, left knee is flat against the bed and comfortable. I'm using my tablet for Words With Friends before I roll over and actually go to sleep. Then I set things aside, roll over onto my stomach, facing left, legs slightly bent and comfortable. I fall asleep very quickly. Then comes the time to shift, whether I'm awake for it or not I have to switch to either on my right side or on my back or back to my left side. Somewhere around the 3rd position change and The Knee is stiff and sore (probably from being involuntarily bent for awhile) and my lower back and hips are squealing in pain. If I'm on either side I've got to position my pillow in between my knees for maximum comfort. Fall back asleep and repeat. By morning I'm so sore and worn out I'm basically waiting for the clock so I can get up. I try to use my core and stomach muscles as much as I can, this does help a bit but the lower back is still sharply painful. By then my back is hurting so much that sleeping on my stomach doesn't work anymore. I've gotten up to pee a few times, often just to try and work the kinks out of my back and knee. I don't go to bed taking any meds but have occasionally taken some Advil/Tylenol in the middle of the night, which necessitates a trip to the kitchen for a snack to eat with it so I won't upset my stomach.
Is anyone else dealing with this? Sleeping is fine (if I could just stay in one position) but moving around is sucking, big time. My shoulders are aching too now from the constant adjustment. We have a CA king sleep number bed with a 3 inch memory foam topper on it and flannel sheets (our main floor bedroom gets cold this time of year). The topper and sheets might be causing more friction when turning than a normal bed but usually it's very comfy and cozy. Anyway, I just wanted to see if anyone else is dealing with the same sleeping issues. I don't remember this happening with my first knee, I only remember not sleeping well until I was off the opioids at 6 weeks.