It was dark when we left Chicago (after another hour on the tarmac), but we flew northwest and by the time we were over Alaska, it was quite light up in the air (though the sun had set on the ground) and the sun was on the horizon for the rest of the flight. Though it was actually a sunset, it was extremely disconcerting because it was about 4am at home and it had been dark for a while, so it felt like it was dawn...