I'm sure there are safety aspects to consider, and the bottom line is that everybody needs to see where they're going and what they're doing, but...
... Isn't it so much nicer in the cabin at night when the lights are off? It's one of my pet hates about medium haul night flights - you're weary eyed and want some sleep, but it seems there's only two options on these aircraft, on or off!
Is it just long haul aircraft that have dimmed lighting as an option, or is it something specific to the airline?
Apologies in advance if it's a stupid question.