I also normally read multiple books at once, as different media lend themselves more naturally to different devices and different times of the day. I tend to have:
- A non-fiction book which I read on the Scribe (especially if there are images and diagrams), typically during the day
- A fiction book which I read on the Oasis, mostly in the evening (good size for reading in the bed)
- An audiobook to listen to while in transit or when I walk the dog
Sometimes 2 and 3 will be the same when the audio version is not too expensive, but it does mean paying twice for the same book so often they'll be different books.