http://sleepdisorderchannel.com/jetlag/An explanation of jet lag, symptoms, causes and management as well as a discussion of circadian rhythms.» Overview, Symptoms, Circadian Rhythms Overview, Symptoms, Circadian Rhythms
Jet lag, or desynchronosis, is a temporary condition that some people experience following air travel across several time zones in a short period of time. This causes the traveler's internal clock to be out of sync
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Explains how to reset your body clock by following a carefully timed program of light and dark. The site calculates the timing for you. Calculates the hours for different time zones.