I work nights (only 2 nights a week right now though). It's not so bad. I'm guessing I would be a bit more stable if I had the sleep schedule of a normal person, but I kind of like my schedule. I've worked evenings or nights for most of my working life so I don't really know what working 9-5 would be like. Even when I was in school and was getting up at 7am I wouldn't go to bed at night until 3 or 4am. I think I'm just a night person (who also doesn't need much sleep). I know that's not ideal, but I don't know how big of a deal it is. Maybe someday I'll have evidence one way or the other. Though I friggin hate mornings (and traffic), so having a day job sounds awful to me right now.