Think and dream. Some of the most imaginative, witty/acerbic people I know spent lengthy periods of time as children in hospital in the pre-digital age. I’ve no idea whether it’s cause or correlation but how many opportunities do you generally get to lie back and let your mind wander?
I’d echo that although with the caveat is that of the people I know like that its wasn’t so much the long stay as the sudden brush with near-certain death that put them there (brain tumour, run over by a bus, ambushed by the Viet Cong) that was more of an influence on their personality 🙂
But thinking time is certainly valuable – for me it was a rare chance to plan, all I normally get to do is react.
Echoing the convenience of Kindles/ Tablets over books – if you expect to do a fair bit of audio book/podcast/film watching and stuff you can find that your attention span for such things is much longer than your tolerance for ill-fitting or uncomfortable earphones.