A few summers ago I worked at the post office. From 2:30 am to 10:30am, running a machine that sorted letter size mail.
I'd usually go to sleep about 4:30ish in the afternoon.
Towards the end of the summer, about once a week, I would also do collections at the end of the day (getting the mail which was picked up by the carriers ready for transport to downtown) and get done about 6:30pm, two hours after I should have been sleeping. Then an hour or more to get home, sleep, hour back. I might have well just slept in my car in the parking lot.