The last point is more important than you might think. Traveler reports regulators require a plane to be evacuated in 90 seconds in the case of an emergency. If there's an accident and the passengers and crew have to rush out of a dark plane, the sudden flood of sunlight may become disorienting and slow the evacuation process. Yes, it's just a few seconds, but if you have only 90 seconds to get everyone to safety, those few seconds matter.
Even if it's interrupting your nap, cut your flight attendant some slack on this one. You hope nothing bad happens, but if it does, raising your shade is a smaller inconvenience than meeting your doom in a fiery fuselage.
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