Most night markets close at 11 pm but huai khwang keeps going until 3am officially, though individual stalls and the porridge vendors outside often stay later depending on crowds

The khao tom stalls serve proper late-night rice porridge with everything — Pork blood, century egg, crispy garlic. Boat noodle vendors set up around midnight. Prices are local rates, ฿35-60 per bowl. Take mrt to huai khwang station, market is right there