Congee, or rice porridge, is supposed to ward off hangovers, which is perhaps why so many Sukhumvit night owls and party animals can be found in the Greenhouse Chinese Restaurant and 24 hour cafe inside the Landmark Hotel. The restaurant, which specializes in Cantonese cuisine, serves up piping hot bowls of congee (called jok in Thai) along with dim sum and noodle selections. If you aren't up for Chinese, Greenhouse also takes a stab at western dishes, serving up a pretty serious hamburger amongst other things. The decor is pretty plain, but most folks on Sukhumvit at 3-4 a.m. are not looking for anything fancy, and find this a welcome respite from the heat and night parties outside.