Eli5: how can a 14-15 hours flight trip can make you feel jet lagged but even a long 20 hours train journey doesn’t have the same effect?

Question

Is it because typically during these long flights there is a a change in multiple time zones and that messes your circadian rythm?

In: 541

Answer 1

A jet lag is caused by the time zones, not by just sitting in a plane.

If you leave at 8am and 12 hours later it’s still 8 am and you need to stay awake the whole day, it’s a jet leg.

Trains don’t bring you to the other side of the world in 20 hours, 2/3 timezones at most