This is one of my pet peeves, too. When the cabin is pitch black and it's obvious people are sleeping and someone opens a window, lighting the whole cabin and keeping it that way. Their need to see is more important than the 100+ other people who want to sleep. Drives me crazy.Number one pet peeve when I travel : People who constantly open the window when almost all the passengers are asleep. I mean, what in the world are you trying to see there? Can they be more considerate? Ooohhh, that really annoys me!