I had the luxury of a 12 hour layover in ATL. This would be not cost effective for me at all in that case.
After I ate and had as much fun one could have in ATL (about an hour) I went into the SC in C.
In the corner room there was a dude talking on his cell phone but I can fall asleep in any environment. Woke up and there was 10 other people sleeping in the room with me! LOL
I assume once people see someone sleeping, they keep their cell either out or very low, this allowed everyone else a chance to come in and crash, so it is possible. ^