Everyone who purposes to visit a country with an unfamiliar climate must realize that his general condition, his capacity for work and also his mood will be influenced. Nor may one overlook the effect of time changes on the body in long-distance flying.
The numerous processes of the human body are patterned on a day-night rhythm dependent on an inner biological clock. It should not be difficult to understand that changing one’s location quickly in either direction, west or east, tends to disturb this rhythm. On an intercontinental flight from Frankfurt to New York there is normally a time difference of six hours, and on a jet trip to Sydney, Australia, the difference is nine hours. How confusing when on arrival your already strenuous day of travel suddenly becomes six, eight or even more hours longer. Since the human body can only compensate (some say) for a two-hour difference a day, you can easily figure out how long it will take your inner clock to become properly regulated again. After your return home the entire procedure will take place again in reverse.
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