>>I suffer the same problem. I have never been able to nap during the day and not have it keep me awake all night. It really created problems for me when I had to be awake for 36 hours one time.
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>I've learned, over time, to take 5 to 15 minute naps. May have to do something with acupuncture - the first sessions I had back in nineties have taught my body how to relax and breathe deep, which somehow started happening during these naps. And I don't do that every day, either - sometimes a week passes without one, sometimes it gets as bad as three times in the same afternoon/evening. May have to do with my pressure getting low and me becoming sensitive to weather in the last decade or so. Rainy day does make me sleepy.
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>As a rule, after such a nap I'm fresh and operational for another four hours or more.

I think they call that "power-napping". I sometimes drop off in the bone-orchard (graveyard) where I have my lunch. In fact, last week some concerned passers-by came up to me with "Excuse me ... Are you all right?". I had to begrudgingly and reluctantly climb out of my somnalence to assure them I was.

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>>>Getting back home (flying east) rarely is a problem: I can take a nap any time of day.
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>>>The problem for me is that if I sleep during the day, I am awake all night.