Day shift, night shift, rotating shifts, double shifts, split shifts...
People who work "regular day hours" might have a crappy job, while people who work the night shift get to hang out with all the other cool nightshift people.
I work a "shift". 8:30 A.M. - 4:30 P.M. Three problems of said shift are:
1) It is unfathomable that anyone would want to be awake between 4:30 A.M. and 10:00 A.M.
2) The shift is spent sitting at a desk (My most enjoyable job had me running around a sales floor for 6+ hours)
3) It supports the ridiculous notion that people need to conform to a 24 hour day mentality.
(Yes, point 3) may contradict with point 1) under certain circumstances.)
As long as I accomplish necessary weekly tasks, what difference does it make whether it feels good to cram the necessary hours into a couple of days or spread them out throughout the week?
Yes, this would make scheduling a problem for many schedule makers. But: Many non-customer facing paper pushing code writing office type jobs do not necessitate regular scheduling.