Indeed. My circadian rhythm is set later than some of my colleagues, so if I'm working on something between 2200 and 2400, I set emails to be sent at ~0700 - 08

Indeed. My circadian rhythm is set later than some of my colleagues, so if I'm working on something between 2200 and 2400, I set emails to be sent at ~0700 - 0800, when I know they'll be starting work. I get no sort of he's-a-hard-worker credit for working late, but plenty of up-and-at-'em plaudits when they receive an email at what they think of as the "correct" time of day. Meanwhile, I'm asleep, and catch their first round of replies when I wake up. It's somewhat ridiculous, but not a big deal.