Calories

Generally, I log until I go to bed for the "night". I did that when I was working backshift too.

Just pick one way and be consistant.

I routinely stay up late, and just keep logging on the same day between rising & bedtime, closing the day before I go to bed. New day starts next time I get out of bed. (I don't routinely eat in the middle of the night, but if I did I'd find that easier to log the next day so I'm not mucking with technology in a sleep-fog.)

But, as rankinsect said, it really doesn't matter. Just pick one, and be fairly consistent. Your body's in continuous operation; it doesn't care about day-boundaries when it comes to calories - a little extra one day can balance out against a little less the next. Just handle the logging the way that's easiest for you.