alt Hacker NewsFront light would make it the perfect device. I use it on the go everywhere now, to limit the distractions inherent with trying to read from my phone. But in bed having to pull out a book light or a headlight is an annoying step that risks disturbing my partner.
I bought the book lights that they sell along with the device and they're perfect for it. They include an adapter so they magnetically attach to the back, or they can clip to the folio.