I’ve had to travel for work through too many time zone to notice any effect from an hour change.
I used to spend 36 hours travel (including multiple layovers) to work in Yemen, 11 hours different time zones.
That would mess up the body clock.
That would mess up the body clock.
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I knew a guy that would work day shift for a month. Next month it would be the mid shift. 30 days leter it would be nights.
Lather, rinse, repeat.
Now THAT. That messed up a body clock. Big Time