@saeternes : my PT guy made me elevate the leg - as straight as possible - for 20 minutes sessions 3 (or more) times a day. I put my heel on the armrest of the couch while on my back. For me, discomfort set in after 5 minutes of that, by 10 minutes I was in pain, and by 20 minutes I was in tears. Hard to believe that just laying there, doing nothing but keeping knee totally straight can be so bad. In addition, I would sit on the floor with my legs straight out, and push down hard on the TKR knee for several 30 second sets, also a few times a day. It still took me months to get those last 1 or 2 degrees. At least you are lucky that you can sleep. I think I averaged 4 hours or less for the first month. Mostly because of pain. And of course I did not do my usual activities or exercising to the level that I’m accustomed to, and that make me tired enough for a solid, uninterrupted sleep pattern.