Using the least amount of light possible to get around helps avoid disturbing the body's circadian clock.
CNN: Sleep tips for the road-weary
The genes that run the circadian clock are not yet fully understood.
BBC: Body clock 'set before birth'
Its functions are vital to the regulation of the body's "circadian rhythms", whose powerful clock-like mechanisms synchronise the body with the 24 -hour period that is day and night.
BBC: NEWS | Health | Brits stock up on US jet lag remedy
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