All the bars are closed, there's no life on the streets, but you and your friends aren't ready to trundle home. Plus, you're all starving. Usually late-night fare is limited to those 24-hour egg-and-bacon places or the drive-thru lane at a fast-food joint. But you want real food. Mai's Restaurant offers an extensive array of Vietnamese food, and the eatery's schedule definitely keeps late-night diners in mind. Open from 10 a.m. to 2:30 a.m. Sunday through Thursday, and 10 a.m. to 3:30 a.m. Friday and Saturday, Mai's is jam-packed during lunch and dinner, and sometimes just as busy late at night. The soft spring rolls and accompanying peanut sauce are second to none in the city, and the various combinations of bun (vermicelli) just may hold the magical powers of menudo in warding off next-morning hangovers.