I am a nurse, and after years of watching folks be in the hospital, here is what I would bring:
~Real tissues
~My favorite pillow in a VERY bright pillowcase(so it doesn't accidentally go to the hospital laundry)
~Slippers
~Easy on/easy off bathrobe
~I wouldn't bring my own jammies because the johnny coats make it easier to deal with checking incisions etc. and if you have bleeding/drainage, why ruin your own jammies?
~Cell phone, if it doesn't interfere with anyof the monitors. Check with your nurse.
~Fan, but if it's electric, the biomed dept may have to come up and OK it
~Clean underwear
~Hair care products, if you want more than enema soap which is all most hospitals have in terms of shampoo(although I will say, castille soap, which we use for enemas, does leave the hair nice and soft and it smells nice!)
~Magazines or word puzzles, crosswords etc. After a while, the TV gets boring