Plenty of people sleeping in airports around the world. I've had to do it a few times (thankfully not in the recent past) when a very late arrival and early connection meant a hotel was pointless. American Airlines at T4 in LAX even provide camp beds and blankets. The lucky few can then head off to the rather fine Qantas first class lounge in TBT for breakfast - assuming any Emeralds would be camping out in the first place :-)