I think that is more common than most know. At my last job I used to work from 6am till about 9 or 10 pm five days a week then usually I would work from about 8am till about 8pm on the sixth day. Many overnights there. Looking back I did that with several jobs. It was my own doing. But I felt responsible. Now I work 7am - 4pm five days a week most of the time. Very little responsibility other than what I have to complete on my own. It is a nice break.