I was doing stairs as soon as I got home the day after, but not in a 6-pack kind of way LOL. Like a toddler, good leg up first, bad leg down first. I was really lucky and could go down normally in about two weeks, but the first hip was not at all that fast. Up is another story, sigh.
I'd call my OS office to find out what they recommend re sleeping on op side. Lots of people have come up with workarounds involving an entire Bed Bath and Beyond's worth of pillows. It's SO hard to have to sleep only on the back, or even back and the other side.