Um, what are you buying at 3 in the morning?
Booze, cigarettes, various items to satiate the munchies, Advil, Altoids ... It's good to know if you need something, you can get it. And it doesn't even have to be illegal; most times for me, it ain't.
Living in a city is the life, personally. There's so much collected in one place: want to skip from a posh coffee shop to a rare vinyl store to the Whitney Biennial to a pizza place to umpteen bars,...