M. Shanghai on Havemeyer serves untill 2 am, try the Morning Glory Greens and the Juicy Pork Buns (soup dumplings). Much better then you'd expect from a williamsburg place at 2 am!
Also late is Snacky on Grand, not far from M Shanghai, they serve Sake and korean snacks and full meals, some good stuff and fun stuff like Hot Dogs with Kimchee (it's like saurkraut, right?).
SEA- I only take people there who are in from out of town and don't know good Thai food. It is very much a scene, and even though they serve late, at around 10pm the front half of the place is more like a club then resturant. It's so loud that it can be hard to hear others at your table. Dumont has excellent burgers as well. But yoy have found one of the problems with dining in williamsburg. No one serves good food very late.
Pretty darn late; I'm guessing they close at 2.
That falafel rules — especially with the pickle — I had no idea (on a previous visit I ordered the shawarma, a big mistake).
Dumont Burger and especially Marlow & Sons are good options. Roebling Tea Room is open fairly late as well I think.
Marlow & Sons, Diner, and the aforementioned Dumont Burger are your best bets for a late-night fix. Moto also serves until around midnight most nights and is worth a visit for the atmosphere alone - the food is interesting but inconsistent (I'd recommend sticking to the paninis, mac and cheese, and small plates unless one of the specials looks truly unmissable). Note that all save for Dumont Burger are pretty far South. Though beer may have been to blame, I've had some surprisingly tasty small plates from Wells Ales and Lagers across from Dumont Burger as well, and they serve well after 10 on most nights.
SEA serves highly-americanized Thai food, which I know some people prefer. They do a fine, fresh take on drunken noodles (make sure to ask for it very spicy or it can be a bit bland), but avoid dishes like whole braised fish that need authentic spicing and top-notch ingredients in order to stand out. The space is definitely a scene - think Bland-hattan people cooing over what they assume to be a distinctly Williamsburg ambiance - but it's not a terrible starting point for a night out.
314 Bedford Ave, Brooklyn, NY 11211
Marlow & Sons
81 Broadway, Brooklyn, NY 11211
85 Broadway, Brooklyn, NY 11211
Wells Ales and Lagers
303 Bedford Ave, Brooklyn, NY 11211
394 Broadway, Brooklyn, NY 11211
114 N 6th St, Brooklyn, NY 11211