Earplugs
Product
Blocking noise during sleep in hospital post-surgery to maintain circadian rhythm and improve recovery
"Great earplugs to keep it as quiet as possible so you can sleep on as normal a schedule as is possible for you. If you can be positioned next to a window, I think if you're giving a kidney, they should put you next to a window."
More source quotes
"I also put on earplugs and headphones."
"Sleep until I wake up, caffeine, nicotine, earplugs, a room with no windows"