Jet lag

Jet lag is a temporary <a href="/facts/Physiological/fh25y2pQ">physiological</a> condition that occurs when a person's <a href="/facts/Circadian_rhythm/rwQh0ClJ">circadian rhythm</a> is out of sync with the <a href="/facts/Time_zone/x5JzdlX8">time zone</a> they are in, and is a typical result from travelling rapidly across multiple time zones (east–west or west–east). For example, someone travelling from <a href="/facts/New_York_City/YlyvFmVC">New York</a> to <a href="/facts/London/KozCCsy9">London</a>, i.e. from west to east, feels as if the time were five hours earlier than local time, and someone travelling from London to New York, i.e. from east to west, feels as if the time were five hours later than local time. The <a href="/facts/Phase_shift/cpGtuVll">phase shift</a> when travelling from east to west is referred to as phase-delay of the circadian cycle, whereas going west to east is phase-advance of the cycle. Most travellers find that it is harder to adjust time zones when travelling east. Jet lag was previously classified as a <a href="/facts/Circadian_rhythm_sleep_disorder/N1tXwAPl">circadian rhythm sleep disorder</a>.
The condition may last several days before a traveller becomes fully adjusted to a new time zone; it takes on average one day per hour of time zone change to reach circadian <a href="/facts/Entrainment_(chronobiology)/858ys5sE">reentrainment</a>. Jet lag is especially an issue for <a href="/facts/Airline_pilot/SJaN1UAJ">airline pilots</a>, aircraft crew, and frequent travellers. Airlines have regulations aimed at combating <a href="/facts/Pilot_fatigue/ohUd0Cz2">pilot fatigue</a> caused by jet lag.
The term jet lag was created after the arrival of <a href="/facts/Jet_aircraft/esXNnbbg">jet aircraft</a>, because prior that it was uncommon to travel far and fast enough to cause the condition.

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Jet lag