5. 'Flip-flop'

If your flight attendant seems cranky, a "flip-flop" could be the culprit. And no, it doesn’t involve the beach vacation.
The term refers to a flight attendant’s schedule when he or she flies one red-eye arriving in the early-morning hours, has the day on layover to sleep, and then must report for the first flight out the following morning around 5 or 6. It is the equivalent of forcing a night owl into a morning-person’s schedule overnight.