It is normal to experience travel fatigue or jet lag whenever you have to go to a long flight. Jet lag is a temporary disorder wherein one a person feels some symptoms like headache, dizziness, insomnia, dehydration, diarrhea, etc. After a flight that involves flying to a different time zone, it is hard to have your body go and transition to having a normal energetic body. To fight this, you must be able to fall asleep during the flight. Long hour flights like 8 hours or more, you need to sleep through it. You might not be able to sleep the entire time but it’s important to sleep at least half the time. The second thing to do is to sleep when you land, at night. Fight having to sleep off during the day. The most important third step is to be able to exercise/do cardio on the first morning after you arrive. Exercising will boost your energy and will help put your body right on track.