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2, 3, and 4, sure, but 1, 5, and 6 are common in many non-airport locations
1 for short-haul and 6 for layover longhaul. Or being in an airport that weirdly doesn’t have public transport early morning but has early flights.
No excuse for 5. Society is degrading.
I don’t think it’s common to sleep on the floor in public. Even those who do are typically homeless and many don’t think that’s socially acceptable.