Whether you're a businessman who has racked up thousands of miles on a frequent flyer programme, or you've simply been bitten by the holiday travel bug, any long-haul expedition comes with an unpleasant scoop of jet lag. We used to put it down to the fact that it was just a change in our "states of mind", but studies now show that jet lag is a medical sleeping disorder, that comes as a result of an imbalance in our body's natural biological clock, aka our circadian rhythms. The mention of a sleeping disorder is often cause for alarm, but for…
