In response to the clamor for this topic, here goes.
I used to read history books on the subway (1 1/2 to 2 hours a day of something to do besides be freaked out by the other subterranean denizens, oh, and worry about London style bombings - What, me worry?) but I got to the point where I'd start falling asleep while reading - very embarrassing to drop a hardcover or large softcover book out of your unconscious hands, so I read fiction now which works better for me (in between bouts of Sudoku).
Latest binge - I'm on Book 2 of The Wheel Of Time series by Robert Jordan, which apparently is what many other George R. R. Martin fans/haters read in between volumes of A Song Of Fire And Ice. I didn't know about Book 1 The Eye Of The World at the start - it's like The Shire but with humans, boring!, but it got better and it says something that I'm 2/3 of the way through Book 2 The Great Hunt. I do feel slightly guilty like I'm wasting time I should be devoting to better pursuits but what the heck. Gotta do some work but I figured I'd throw out the first ball.