For a while after a bad leg injury, I had to lay in bed, on my back, with my leg elevated. Either I watched tv and got a crick in my neck (from the odd angle) before a 30 minute show was done, or I tried holding a book up and in the air and reading it, but I never made it more than a few pages before my arms started to feel like very, heavy, looming weights. I ended up listening to a lot of podcasts and phoning a lot of friends. I would have loved to be able to watch tv from my back during that recovery period!
You jest, but when I moved three years ago, I watched about three seasons of Burn Notice lying in bed, holding my phone in an awkward position overhead about 8 inches from my face. It was less bad than it sounds, but this product would basically mean that I could do that much more comfortably, without bleeding light over and waking up my wife (or vice-versa).