Hey morph, that sounds good - how's the icing going? That was the most beneficial non-active thing I did. Your activity and sleep cycle sounds about right, but that will improve.
Early on, I typically did some hallway walking, with no goals other than walking and then having enough left to walk back to my apartment. By the end of the first week, I started outside and walked (with two crutches) about three 1/4 of a mile walks per day.
This was in addition to three PT exercise sessions per day, but very gentle workouts - standing side leg movement, standing knee up like marching, very slow and easy leg back (no stretch or pain, just to get muscles moving), slight knee squat with your upper body straight. All of these I did while holding on to the refrigerator with both hands, facing it.
Lying down on the bed, lie flat and bend your knee, slide your supporting foot flat (very lightly) and back. Another I did was while lying flat on the bed, having put a trash bag under my lower leg, slide the leg sideways and back.
Check with your surgeon first, but these helped me. The walking alone, though is probably the best thing - these others were good exercises and kept me going.
Keep hydrated (lotsa water), elevate that leg when possible and ICE.