Air travel is such an everyday experience these days that we are not surprised when we read about a politician having talks with the Japanese Prime Minister one day, attending a conference in Australia the following morning and having to be off at midday to sign a trade agreement in Bangkok. But frequent long-distance flying can be so tiring that the traveller begins to feel his brain is in one country, his digestion in another and his powers of concentration nowhere – in short, he hardly knows where he is. The fatigue we normally experience after a long journey is accentuated when we fly from east to west or vice versa because we cross time zones.
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