I think I would know better than anyone, last year I was in the hospital sick with cancer.
If he doesn't have a laptop, I STRONGLY suggest pitching it as a group gift for one. My laptop was my lifeline during my hospital stays. Some floors have laptops for patients to use, but I liked the privacy of having my own. I got my own for Christmas in the hospital last year after stealing my moms all the time, LOL.
Blankets and pillows. Fleece blankets are really good for nephew and mom, because those daybeds next to the window are hard and they have a draft. An airbed came really handy for my mom too, and for me to move on when I got to stiff in my hospital bed.
Comfy PJs. I refused to wear the hospital gowns unless I had to go for surgery, I always wore my PJs. I don't think I wore anything bedsides hoodies, sweats, and PJs in the 10 months I was sick.
Itunes if he has an Ipod. Just be careful and don't do like I did, I wiped out all my songs trying to add more in the hospital.
GCs for local resteraunts. Hospital food SUCKS! It's gross, and I lived on fast food in the hospital. It was bad, but I kept losing weight instead of gaining it anyway so my parents were happy to get me to eat.
I don't recommend any foods or smelly things. I know my taste buds changed a lot. Like, Coca Cola tastes like Grape Soda, but Mac and Cheese still tastes great. My tastes changed on a whim a lot, like one day I would chow down Ice Cream all day, the next I couldn't stand it.