The good news for travelers is that sleeping in an airport usually isn't against the rules, but this doesn't mean you can sleep anywhere at any time undisturbed. Rules can vary from airport to airport, and some take a firmer stance than others.

Yes, you can generally spend the night in most major international airports, especially if you have a valid boarding pass for a flight the following morning. This is a common practice for travelers with long layovers or those looking to save on hotel costs for early departures. However, the experience varies wildly; "sleep-friendly" airports like Singapore Changi or Seoul Incheon offer dedicated quiet zones, recliners, and even transit hotels, while other airports may have armrests on all benches to prevent lying down. You should check the "Sleeping in Airports" guide for your specific terminal, as some smaller airports close their secure side overnight, forcing you to wait in the public landside area. Safety is paramount: always sleep near other travelers or security cameras, and use your luggage as a pillow or lock it to your person to prevent theft. If your budget allows, look for "Minute Suites" or "Sleep Pods" within the terminal for a more restful and secure overnight stay.