I went through a phase when I was a kid where every night before I went to sleep, I would get ready in case my bed turned into a spaceship. So I would carefully arrange the following items under the covers before I climbed in: a hairbrush, a couple of stuffed animals, several pairs of underwear and a pile of books. I knew I probably wouldn't end up needing it all; it just comforted me to know that should I be unmoored, I'd at least have clean undies and something to read.
So it just seems natural to me to bring three books and a blogging-enabled phone to bed for what will likely be less than an hour of reading. It's all there if I need it.