Don't know what airline you are flying out on, but I am told the Admirals club at Rio de Janeiro-Galeao International Airport is very nice, and even has showers so you can freshen up before the flight. If not an Admirals Club member, also accessible for First and Business class on AA, if you are on AA coach and have AMEX Plat, or if you have Priority Pass. If not any of those, might be worth the $50 day pass fee just to have a nice "day room" for a few hours! Open until 9pm or 10:15pm depending on day of the week.