Dreamland

Not quite as in-depth as I had hoped, but still a good read. Since I find sleep utterly fascinating, I read a lot of articles about it anyway, and there wasn't much new here for me. But if you're not weird like that, there will be plenty of good info here. I did find the chapter on sleep crime riveting, and was very interested (i.e., disturbed) to learn more about the science (or lack thereof) behind sleeping pills.