We are at the end of that second week. Here are my observations about working 1 to 9PM.
-- having mornings off allowed me to schedule doctor's appointments (and the weekday scene is much less of a zoo than Saturday mornings are)
-- doing laundry in the morning is easier for me than at night because I'm a morning person
-- sleeping until 7 or 7:30 is a real luxury (no, even I don't wake up naturally all the time at 5AM)
-- retail shopping is easier on a weekday the morning if I have to bring the kids with me, compared to weeknights (when they should be eating dinner, showering, or getting ready for bed) and the weekend madhouse
-- I don't have "alone time" at home because I'm so tired at 10 when I get there that I have to go to sleep soon afterwards
-- I have to either eat lunch early, before I leave the house, or bring two meals to work with me plus snacks
All in all, there are a lot of pluses but I really find that I'm dragging if I have to actively be in "use the brain" mode so late at night. So I have a lot of respect and admiration for people who work the night shift...but I conclude that it would be difficult to do on a regular basis!