I get that "uncomfortable" feeling in my operated leg at times, too. It is more apt to be towards morning but last night it was after only a couple hours of sleep. But I only had one leg done so big difference there. For me I can go to my back and put my leg on a pillow and that helps for some strange reason. I think once you go to your side, you will start to sleep better. I know I did. I, too, forget about the Tylenol because it never helped st all with the OA. I always used Aleve instead. Now I'm feeling my hip at times, especially after sitting a bit and I caught myself limping a bit yesterday. I'm going to ask PT about it and maybe even take a week off from PT to see if it goes away. I'm just not sure what is causing it or if it is just a part of the healing process.
It sounds like your day is off to a rough start. Hopefully that little rest you get after the morning work, will rejuvenate you a vit and help you make it through the rest of the day.