I've suffered from jet lag for about one week, and now finally I feel better. When I got back eastward from Germany last autumn, I had jet lag too. The jet lag that I had on my eastward flight was always worse than that of the westward flight from Canada. The time difference between Vancouver and Japan is 7 hours and it's the same as between Germany and Japan. The direction of the flights would have more effect on how serious the jet lag is than the net time difference.
I have thought above about jet lag. Then, comparing the flight from Japan to Canada with that from Germany to Japan, both flights are eastward and the condition is just the same, but my jet lag gets better in a day in Canada. It is very curious.
I found a clue to this question today. What I usually do on my arrival day in Canada is take a walk in Whistler village, and I get a lot of ultraviolet light from the sky and snow. However in Japan, I have to work under fluorescent lights all day from my arrival day. Having more sunshine might work for the recovery from jet lag.
When I got back to my office a week ago, a huge amount of work was waiting for me and both the work and jet lag annoyed me. Now, I could go through it successfully, and am going to start writing my blog again about the trip to Germany.
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