Knackering for you but great that Ds is behaving very normally, and intelligently, after all, who wouldn't want to go hone from hospital at 3am? Sensible boy.
Now to make his and your room your home from home for the 80 days.
Thinking of 80 days, 80 days till Christmas as another poster has said; around the world in 80 days. Can you get two large maps, one of great Britain and one of the world, and plant yellow stickers with him on where the Splodges are?
Charts till Christmas, charts till out of hospital, though that might be trickier, advent calendars, possibly a DM or MIL could make a sort of hospital advent calendar, with something to open every day.
Fuzzy felt is a brilliant game at this age. Even if the bits get lost, they don't hurt. I spent lots of my childhood in bed doing them in different ways.
And drawing. I drew all the evil bugs that were attacking me. It was fun. Some had real names, some had made up names. When I was feeling worst we made up the name, and when I was up to it I drew it. My DM was brilliant.
I loved the Richard Scary books and could gaze at them, fuzzy felt like, for ages. You didn't have to concentrate as on a story.
And thank god for hospital tv.
Hugs and support from London Splodge.