Pem - It is different for everybody, but I will throw out my crazy solution. I tried the Laz-Y-Boy and it was just awful, so I was committed to make the bed work.
I tried a wedge pillow next. It was too high for me to sleep comfortably on (lying flat felt the best) and was not high enough to be much help maneuving out of bed. My wife was pregnant at the time, so I had her sleeping in another room so that my constant nighttime awakenings didn't wake her up too. Anyway, I was desperate for a independent solution, and someone was nice enough to give me something called the "Mattress Genie", which basically transforms a normal mattress into an incline bed.
I was able to lie flat on my back to sleep, then when I woke up, just pushed the button on the control panel to elevate my head, then just sort of rolled right out of bed, piece of cake, didn't need any help. I know a lot of people get out of bed on their own no problem, but for me, it was a big challenge in the beginning, maybe based as much on fear as pain.
Anyway, I hesitate to mention, because it's expensive...I never knew how much it cost until I just did a web search. It's also noisy. But should you encounter any of the same issues as me, it worked great.
Overall, sleep was probably the biggest challenge for me post-surgery. Going to the bathroom a lot, combined with weird dreams, combined with early morning back pain, it just wasn't easy. It definitely got better each week, though. I have a thing about never taking sleeping pills, so I didn't, I just got used to sleeping more frequently for shorter periods. It was probably back close to normal by 4 weeks.