Yes, you can sleep in Gatwick Airport overnight, and it is a common practice for travelers with early morning departures. Both the North and South Terminals are open 24 hours a day. The South Terminal is generally considered the "better" option for sleepers because it has more long benches and quieter corners, particularly on the ground floor near the 24-hour Tesco Express. The North Terminal has fewer comfortable spots, though you can find benches without armrests near the shuttle train entrance. While sleeping on the floor or chairs is free, security may ask to see your boarding pass during the night. For a more "proper" rest, Gatwick offers several internal hotels: the YOTELAIR in the South Terminal provides tiny, high-tech cabins that can be booked in 4-hour blocks, while the Bloc Hotel and Premier Inn offer traditional rooms directly connected to the terminals, allowing you to bypass the discomfort of a terminal bench.