Actually, I am alone in my bed <no rude or pity comments, please!>, so there's no issues of disturbing someone else. And yet it's still nice to read a backlit screen on my Treo. I enjoy the way the screen looks, and I like the brightness. But I also know that most people seem to hate the very brightness that I like so much, because people have said that it is an eyestrain for them.
But as much as I like reading with the backlight, the nicer display of an e-ink device pretty much trumps any considerations like back, side, or front lights.