Keeping airplane window shades open during takeoff and landing is a critical safety protocol mandated by most international airlines to enhance situational awareness. Takeoff and landing are statistically the most dangerous phases of flight; if an emergency occurs, the open shades allow both the cabin crew and passengers to immediately see external conditions, such as fire, engine debris, or water, which determines which emergency exits are safe to use. Additionally, open shades help passengers' eyes acclimate to natural light; if a daytime evacuation is necessary, your eyes won't be blinded by the sun when exiting the dark cabin, and at night, they will be adjusted to the darkness, potentially saving life-saving seconds. It also allows emergency services on the ground to see into the cabin to assess smoke or fire levels. While it may seem like a minor inconvenience for those trying to sleep, this rule ensures that in the event of an unplanned incident, the crew and passengers have the maximum amount of visual information to make rapid, informed decisions that could prevent a catastrophe.