I have a Kindle with a backlight that I keep by my bed and I typically read at least a few pages when I try to go to sleep. Most of the content I have is free out-of-copyright books from Project Gutenberg supplemented with more modern commercial ebooks once in a while. I've been reading really old children's fiction lately (e.g. Anne of Green Gables most recently) since that's usually intelligible enough even with some differences in English since it was written (or in some cases non-US dialect differences) and tends not to be so stimulating that it keeps me awake.