Bangkok rarely sleeps — the late-night food scene runs from street stalls to 24-hour restaurants.
Sam Yan's food court (SamYan Mitrtown), various On Nut shophouses, hospital area restaurants near Bumrungrad — genuine 24-hour spots.
Talad Neon, Rot Fai, and several Sukhumvit night markets wind down around midnight — still lively until then for hot food.
7-Eleven is always open — microwaveable rice dishes, fresh pastries baked in-store, hot dogs, instant noodles; not exciting but never closes.
A small number of Chinatown and Yaowarat stalls stay open until 3–4 AM; look for the lit shophouses with steam coming from the kitchen.
Areas with concentrated nightlife — Thonglor, Ekkamai, RCA — have restaurants that stay open specifically to catch the after-bar crowd, usually serving grilled meat, noodle soup, or Isaan-style dishes.
Stick to well-lit, populated areas when eating late alone; the 24-hour spots near hospitals and transit hubs tend to be reliably busy and well-trafficked even in the small hours.