We had to overnight at LGW once. By "we" I mean myself, my wife, and our two youngest daughters, both teenagers.

LGW is actually not too bad a place to while away the hours, what with the various restaurants and such that seem to be open pretty much all night. There are also showers where you could freshen up for 50p or so.

We located a couple of couches and staked them out. I dozed but didn't really sleep; neither did my wife. The daughters had better luck, although the youngest one complained that somebody passing by tried to grope her. She responded by kicking the crap out of him and that was the last we heard from him.

When I worked for an airline, I was stuck in PIT for the night (on my birthday, as it turned out) because there was no room for this poor non-rev. Not fun at all.