The first thought that came into my mind when I read this topic from Long and Short Reviews was a Kindle - however, I'm not sure whether that fits the spirit of it. An ebook reader isn't technically a book, I suppose, so that would be first on my list. I wouldn't be without my Kindle.
The second possibility is a reading light. My husband has one that clips to the headboard so he can read in bed without keeping me awake. Considering he often reads when he can't sleep, it's a real marriage-saver.
Thirdly - well, it's always nice to have drinks to hand while you read, so I have two options. For my non-drinking friends, a large mug for tea or coffee (or indeed hot chocolate, if you're like me and don't like either). And if you feel like something stronger, a bottle of Torrontes wine (trust me on this, it's stunning) or one of the cocktail packs our local restaurants are doing at the moment.
There's nothing quite like reading your favourite book with a glass of wine or a Mojito to hand.
So what are your best non-book ideas for readers?