Indeed. If I moved to the US, after a few weeks I would adjust.
One solution is to create an artificial light & dark cycle that's earlier than the actual daily cycle where I live. That would work - as long as I never left my room.
Surely you wouldn't have to stay in your room 24 hours a day? You could go outside when the light and dark of your artificial cycle and the natural cycle coincided, couldn't you? I don't know how sensitive human clocks are - maybe going out at nine a.m. right after you woke up when you're trying to fool yourself into "thinking" it's noon would create problems having to do with the exact location of the sun - but it seems like there would be a window there.
Full essay: http://www.gwern.net/Melatonin