'Night' is such a relative term when flying long haul stuff. If you fly east, you can easily take-off in the 'day' and land in the 'day', but most of the flight was in total darkness, or vice versa. Going west (chasing the sun) it's the opposite.

And then there's the circadian rhythm issues. You can take off in the day, but it is your body clock's night, or reverse.

For me, the hardest flights are leaving the US, going east, after midnight, in the winter. Most of the Atlantic crossing is done in daylight, sun rise right in your face @ what feels like 3 am, and often as soon as I land, night falls. It makes it easier to sleep once you arrive @ your destination, though. Once I'm away from the US, my body doesn't care if its day or night, except when I'm trying to eat - grabbing a meal is hard when you're hungry but most everything is closed @ night. Aircraft catering can substitute, to a degree.

In short, if you don't want to fly @ night, Atlas, or any other ACMI, is not a good job for you.