Singapore Changi Airport is legendary for being the world's most "overnight-friendly" airport, offering a wealth of 24-hour activities. For entertainment, you can catch a free movie at the 24-hour movie theaters in Terminals 2 and 3, or visit the Jewel Changi, which remains accessible and beautifully illuminated at night (though the Rain Vortex waterfall typically stops at midnight). For relaxation, there are numerous Snooze Lounges with reclining chairs located airside in every terminal, or you can book a block of time at a transit hotel like the Ambassador Transit Hotel or Aerotel, which features a rooftop swimming pool. Foodies can enjoy the Singapore Food Street in Terminal 3, where many hawker stalls operate late. You can also wander through the Butterfly Garden (T3) or the Enchanted Garden (T2), which are open around the clock. With free high-speed Wi-Fi, massage chairs, and world-class lounges, an overnight layover at Changi feels less like a chore and more like a stay in a luxury terminal-city.