Graveyard or Day job?

Here in my country, lots of people work in call centers. And their jobs require them to work at night and sleep during the day. I tried doing this kind of job but I only lasted one week. My body was so stressed with the lack of sleep that I lost weight in a matter of days, better than any weight loss product. Do you prefer to get up early in the day to begin work, or would you rather get up later in the day and work until late in the evening?