The MiniMotel is a tiny, fold-up tent with everything you need to camp out in an airport or other transit station, including an inflatable air mattress, alarm clock, reading light, toothbrush and paste, and even earplugs. Everything folds up into a pouch small enough to be included in your carry-on luggage. Incredibly, it's reasonably priced at $50.
But I have to agree with Mark Crummett, who suggested the MiniMotel to us, when he says, "I can't believe that airports would let something like this be deployed by mere civilians. Throw this thing up and I bet you'd get rousted by Security within 15 minutes." The only way I could see these getting traction is if an airline bought a bunch to be used during emergencies — and even then the airline would probably catch hell for trying to get passengers to camp out in lounges instead of providing a proper hotel.
MiniMotel product page [MiniMotel.net]