Home to Chulalongkorn University, a 24-hour food court, and some of the cheapest good eating in Bangkok.
Sam Yan is a student district — young, affordable, unpretentious; the Foodland supermarket and SamYan Mitrtown mall are open late.
The SamYan Mitrtown food court operates 24 hours — this is not a tourist attraction, it's where Bangkok's night-shift workers, students, and insomniacs eat.
MRT Sam Yan station; easy and central.
Authentic cheap eating (40–80 THB), no tourist markup, genuine Bangkok energy at 2 AM; excellent for solo travellers who want local food late.