Ear plugs.
Most of the times that I have been unfortunate enough to have to stay overnight in the hospital I have been fortunate enough to be in a room by myself. One time, however, I was in a room of six and the patient next to me had the TV on to a wrestling channel that she slept serenely through. My ear plugs helped ensure that I slept serenely as well (as much as one can being woken every hour to have one’s vitals taken).