Planning on being there a while pellicle? (This from a person who bought a 1,000 piece jigsaw puzzle of white swans on a dark lake, what was I thinking, and took two weeks to make the border - then gave up.)
Back to the topic - for me personally, spending a week in pyjamas and robe was the last thing I wanted to do; I wasn't going to be sick, and that's what sick people do. If you are of a similar mindset, consider sweatpants and large t-shirts instead of a robe and pyjamas. I often got mistaken for a visitor instead of a patient on my hourly walks, and I kinda liked that!
I took a sport jacket, a comfortable pair of pants and dress shoes. And put them on every time I went for my walk, even if I was just going down the hall. I agree with SkiGirl, I was NOT sick and did not want anyone, including myself, to think I was. I did not sleep much at all, so often I would be up walking around the ward in the middle of the night looking like I was heading out dancing. It was great for the spirit.
A laptop, with a DVD player and all 7 years of The West Wing. And if you can make it work in the hospital, get Netflix. If you are not good at sleeping in a hospital, 24 hours can be a long day. Reading alone will get boring.
I had earplugs, but they did not work for me. When I put them in, I could hear my mechanical valve go bum-pity bump, and that would keep me awake. The sound deadening headphones would be a good choice, if they work for you. A hospital is a very noisy place, even in the middle of the night.
Walk, walk, walk....and use the breathing thingy as often as you can. The more you do both, and the sooner you get a bowel movement, the sooner you go home, and the sooner you can get some real rest.