The "best" seat for sleeping depends on your personal need for privacy versus mobility. The window seat is generally considered superior for sleeping because it provides a solid wall to lean your head against and ensures you won't be disturbed by neighbors needing to use the restroom. You also have control over the window shade to manage light levels. However, the aisle seat is better if you are tall and need to stretch your legs into the aisle or if you anticipate needing to get up frequently. The downside of the aisle is the "bump factor" from service carts and passing passengers, plus the fact that you must stand up whenever your seatmates need to exit. In 2026, for long-haul or red-eye flights where rest is the priority, most travelers choose the window to create a private "nook," while business travelers often prefer the aisle for a quick exit upon arrival.