Atlas Shrugged - Ayn Rand

...wait, something that will not put you to sleep?

If you can find some David Sedaris, he is fantastic. Really funny stuff. His books are fairly short, so you can just try him out. I highly recommend.

If you want more like novels, Catch-22 or World According To Garp are good. They are both very funny, but it is a more intelligent type of humor. It is more subtle.

Kurt Vonnegut is also superb. Sirens of the Titan and Cat's Cradle are phenomenal.

EDIT: I spelled intelligent wrong...christ.