I've stayed overnights at Taiwan Taoyuan International Airport, Incheon International Airport, Singapore Changi International Airport, and Auckland International Airport.
But, none of these airports is far from staying comfortably. In the first place, it's difficult to find out the place to sleep. Most of the seats have already been occupied by professional airport sleepers. So, I had to sleep without laying my body. The other problem is that it's easily for me to catch a cold after sleeping without comforter. Of course, we can't afford to carry comforter when we travel, and there would be no service as to rent a comforter for passengers.
In my opinion, those who can stay in an airport for more than a week must be a patient person.
