His night is going south(west).
@The Lifeguard, Oddly, in the UK we don't have the phrase "going South" but we do have "sending West" 😀
He must be six hours into his shift.
I NAP HERE NOW!
I like how the clerk either doesn't know about the man laying down, or they do
When you stay up all night to finish a paper, but realize it's due next week.