Jet lag happens to us all when we travel.
But for flight attendants, it's a regular occurrence - and they know a lot more than most travellers about adjusting to different time zones.
To find out how cabin crew tackle jet lag on the job, we spoke to flight attendant and author of "Cruising Attitude: Tales of Crash Pads, Crew Drama, and Crazy Passengers at 35,000 Feet", Heather Poole, and combined her advice with our own research, including this Quora thread on how other airline staff avoid this side effect of travel.
Here's what you can do to beat jet lag: