Sleeping in Airports (Rio): http://www.sleepinginairports.com/casa/riodejaneiro.htm

-There are two "hotels" in GIG: From a Web site on the airport: "Airport hotels include the four-star Luxor Hotel (tel: (021) 2468 8998 or 0800 282 2070) on level 3 in Terminal 1 and the three-star Hotel Pousada (tel: (021) 3398 3852) on level 1 in Terminal 1. There is a 24-hour hotel reservation desk in Terminal 1 on level 3." My wife stayed in the pousada and would not return. The reviews of the Luxor on Tripadvisor (http://www.tripadvisor.com/Hotel_Rev...e_Janeiro.html) are mixed. Sounds like small, basic rooms but better than the pousada, and better than sleeping in the terminal, where the seats are not comfortable. Not sure how early you'll be allowed to check in. Before security there is not much of anyplace to sleep. There are more chairs after security, and there will be people there all night, but not sure I remember seeing any comfortable enough to sleep on (plus, I think there are arm rests, making sleep difficult).

No Delta lounge that I know of, but there is a combined VIP lounge in the international departures area of the terminal TAM uses. Not sure how late it's open and whether you'd have access due to Delta Sky Club membership (we used it since we were flying Biz Class on US Airways). I doubt it's open all night (doubt the TAM club is, eitehr, but you can check with the airlines directly). I doubt you would be allowed past security in any terminal your airline isn't using, if it came to that. There is an American Express Centurion lounge ouside of security, but, again, I doubt it's open all night.

5:45 p.m. until 6 a.m. is a long time to wait on the terminal's chairs. You could find a hotel in downtown, or even Flamengo/Botafogo, and take an early taxi to the airport for your departure. I am not a fan of GIG. About the best thing I can say about it is that it's not GRU.