Jetlag

Jetlag affects most people to a small or large degree after crossing more than one time-zone. As a rule the longer your flight the more extensive and troublesome jetlag appears to be. The symptoms of jetlag appear to be more pronounced for some people after travelling from east to west, or when several flights are undertaken in succession, but disorientation occurs whenever you travel by air for extended periods of time.
Those people with fixed routines appear to be affected to a greater extent than children or people whose lives are less structured. However, flight crews who travel extensively may still suffer from extended fatigue and other symptoms associated with jetlag, and require significantly longer periods of time to recover from long flights when they do not have enough time on the ground between flights.
Other contributing factors include dehydration due to the dry air that is circulated during a flight, increased air pressure once cruising altitude is reached, inactivity due to restricted seat space and the fear of disturbing others if moving around the cabin frequently.

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