That wouldn't help for the long term; circadian clocks, even wonky circadian clocks, are set by cycles of daylight and darkness.
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.
Full essay: http://www.gwern.net/Melatonin