Is there any place of any sort within, say, ten blocks of Columbus Park that's open really late (2am - 6am) on weeknights? I'm thinking ideally a coffee house or diner, along the lines of Esperanto on MacDougal would be awesome (though I don't have high hopes.) Someplace where I can quietly study or hang out with friends. Cheap Chinese restaurants open late? I know 21 Mott is open til 1 on weeknights, which isn't very late at all. Anything else?