Hi, I'm not sure how it affects us or our circadian rhythm (we're still working on that chapter in class lol) but I am a night owl, too. I generally think better at night, work better at night, and even feel better at night. During the day I just feel like I'm trudging along. Barely living. At night, I come to life. I get most of my writing done at night, even. I've never felt like I'm doing anything wrong personally. I do realize, though, that it seems to go against our nature as we're not really nocturnal.