My Dad was a professional pilot, who flew all over the globe, his last duty station being part of the Presidential squadron at Andrews AFB outside of Washington, DC. His flights would take him from country to country and he was usually away for two weeks at a time. Over the years, he found that eating breakfast every meal helped him acclimate with each new destination and also get back on his regular time when he returned home [he would also eat breakfast when he returned]. I think it was more of a psychological way of fooling the body. He had to sleep whenever he could and did not have the luxury of going through the tiredness until the local bedtime. I do agree with the comments here though, and it has also been my experience that I do better when getting acclimated to the local time the first day.

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