I've lost count of the amount of times an inconsiderate, ill-mannered oaf has decided to disturb my rest by flooding my row with light. If people want it shut, then leave it shut.
You are free to use a blindfold thingy (what's the real name?) that covers your eyes. Lots of people have them on long haul and sleep better as a result. In doing so you shut out the light from the window and the other guy gets to watch sunrise over the Himalayas and appreciate the wonder and beauty of nature. No I'm being serious, it's a joy to me and privilege to be able to do so, kinldy consider me as well as I love my window seat and want to make use of the view.