Where Did Everyone Sleep?

I grew up in New York. I'm a New Yorker at heart. I went to Columbia University for grad school. I lived in New York for a good part of my 20's and 30's. I have a question. When you take all those buildings full of all those hot tiny apartments connected by elevators and you let all the occupants leave by stairway and they are out on the street -- and add in all the commuters from Connecticut, New Jersey, Long Island, you name it ... well, where did everyone sleep last night? Did anyone sleep last night? Better call some New York bloggers and start finding out.