On my recent US CDG-PHL, flight, I was blinded by the light from 1A (the only one who refused to close theirs). I asked the FA nicely, and he did a wonderful thing: He just walked over and closed the shade. He didn't even ask permission.
I have no sympathy for the "I'm not sleepy yet" argument. That's what lights are for.
Now close the shade and let me watch my flick.