While I wouldn't make a night at an airport part of a planned trip, many people who travel on a budget around the world do.
If you are one of those travelers, who'd rather break his back than spend his money, this site is for you: SleepingAtAirports.net will provide you with essential airport-sleeping tips, lists of best and worst airports to sleep in (constantly updated by users) and reviews of certain airports.
It comes as no surprise to me that people fave Schiphol airport in Amsterdam (as you may remember, I like this airport too). And one of my worst airports, Chicago's O'Hare, is also one of the least favorite. The worst on that list is Bombay, India - and I agree with every word in the review.
You can also post your airport sleeping stories on that site - and you can post them here if you'd like. Sadly, all of us have spent at least one night of our life trying to catch some Zs on a hard bench, waiting for that f$#*ed up weather to clear...