Re-entry, or Reverse Culture Shock
February 1st 2013 Jetlag Formula (Rule of Thumb) is one day to readjust sleeping patterns for every hour difference between beginning and end of your journey. Modifiers would include length of time in the beginning location, nearness to the equinoxes (mid point of summer and winter) and general wellness. I always make a point of staying up until local bedtime on the first night, to ensure the fastest recovery rate.
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