If you've ever travelled more than a few timezones in a few hours, you'll know that jet lag is terrible.
It happens because your body's internal clock gets all out of sync.
The good news is external signals help regulate your internal clock, and you can use that to your advantage.
1. Start to shift your body clock before you go anywhere.
2. Adjust your watch as soon as you get on the plane.
3. If you need to sleep on the plane, avoid sitting on the sunny side.
It's going to be hard to convince yourself to sleep if you have bright daylight streaming in through the window next to you. You can use the website Sun Flight to check where the sun will be during your flight to book the best seat.