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Jet lag is malaise resulting from rapid transit to a different time zone and is experienced after travel across multiple time zones. It occurs when the body’s circadian (24-hour) clock is out of sync with the local time, such that an individual’s circadian rhythms are aligned with the previous time zone. As such, it is considered a circadian rhythm sleep disorder.

Remaining at the new destination after crossing time zones is beneficial, but it does not ensure rapid phase shifting (or realignment) of the circadian system and sleep-wake cycle to the new time zone and light-dark cycle. Usually, individuals arrive at their new destination with an accumulated sleep debt (i.e., elevated sleep drive). As a result, the first night of sleep in the new time zone ...

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