Almost all major airports have a Chapel. Almost anytime of day they are quiet places to escape. In the middle of the night they are almost always empty, and most have pews that you can lie down on for a few. I was once stranded at MSP and got a good 4 hour sleep in the chapel there...done the same at ORD. There are now two Interfaith Chapels located at Bush Intercontinental (IAH) Airport. The first is located in Terminal C near Gates 29-33 and the newest chapel can be found in Terminal D, near Gate 8.