Choosing between a day or night flight for long-haul travel involves a trade-off between comfort and jet lag management. Night flights (often called "red-eyes") are generally preferred for eastbound travel (e.g., USA to Europe) because they allow you to sleep during the journey and arrive in the morning, theoretically helping you sync with the new time zone immediately. The cabin is typically quieter, and the perceived flight time feels shorter. However, if you cannot sleep well on planes, you may arrive "exhausted" and lose your first day. Day flights are often better for westbound travel (e.g., Europe to USA) because they keep you awake during the daylight hours, making it easier to stay up until a normal local bedtime upon arrival, which is a proven way to beat jet lag. Day flights also offer better meal service and more opportunities to move around the cabin, reducing the risk of stiffness. Ultimately, if you are a "pro sleeper," take the night flight; if you are sensitive to sleep disruption, the day flight is the safer bet.