The length of the flight per se doesn't cause jet lag, only the difference in time zones does.
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Is jet lag worse east or west? Yes. Adjustment to a new time zone is harder when traveling east than traveling west. This is because you “lose” time and you end up trying to fall asleep when your body is actually waking up.
Most people find that jet lag is worse when traveling east than it is when traveling west. View Source . Jet lag differs based on the direction of travel because it's generally easier to delay your internal clock than advance it. Jet lag does not occur on north-south flights that do not cross multiple time zones.
Common ways pilots avoid jetlag is staying hydrated, good rest, avoiding caffeine and alcohol, exercising, or sleeping on the airplane. For long-haul flights airlines use multiple pilots for the flight to allow each pilot to get some rest. The more time zones that are crossed, the worse the jet lag.
The most common reason is that there are no airstrips or airports on many of the small islands, so if a plane had to make an emergency landing, it would be difficult to find a place to land. Additionally, the Pacific Ocean is vast and remote, so if a plane were to go down, it would be very difficult to find.
On arrival, stay awake until an early local bedtime.
If you doze off at 4 p.m. and wake up at midnight, you've accomplished nothing. Plan a good walk until early evening. Jet lag hates fresh air, daylight, and exercise.
Sleep Foundation notes that jet lag happens when we travel across three or more time zones. And, there's bad news for anyone traveling from the U.S. to Europe: jet lag is worse when you travel east than it is when you travel west. Why is this?
“Changes in cabin pressure and oxygen saturation, along with the vibration and motion of the plane, can inhibit gastric emptying,” Allen says. In other words, digested food can't move to the small intestine, making it more difficult to do a number two. This can contribute to feeling bloated, gassy and nauseated.
Key Points. Traveler's diarrhea occurs within 10 days of travel to an area with poor public hygiene. It's the most common illness in travelers. It's caused by drinking water or eating foods that have bacteria, viruses, or parasites.