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When travelling across several time zones because of flying east to west or west to east, you disturb what are known as your circadian rhythms, the natural cycle or rhythm of your life across every 24 hour day.
Consequently, people who travel across several time zones in this way suffer what is known as a circadian rhythm sleep disorder, more commonly known as jetlag.
In very simple terms, suffering jetlag means that your body wants to sleep when it is the middle of the day in the place to which you have travelled, whilst you conversely feel wide-awake and full of vim in the middle of the night. Suffering from jetlag is a disconcerting and debilitating condition, one that generally takes a few days to get over, with the recovery period usually dependent upon the number of times zones which you have crossed.
As a general guideline, it is suggested that most people’s recovery rate will be one day for every time zone traversed in an easterly fashion, or one and a half days for every time zone crossed in the opposite direction.
In addition, there is some evidence that travelling west to east will cause more of a jetlag problem than going in the opposite direction with several possible reasons being put forward as to why this should be.
Firstly, most people have a circadian rhythm that does not exactly tie in with the 24-hour clock which is why it is generally far easier to stay up later at night than it is to get up earlier in the morning.
There is also some evidence that taking a flight going east is more likely to require you to stay up more than one full night in order to make the necessary adjustments to the local time zone.
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