Jet Lag
A temporary physiological condition caused by rapid travel across multiple time zones, disrupting the body's internal clock and causing fatigue, sleep disturbance, and reduced cognitive performance.
Jet lag is a circadian rhythm disruption that occurs when the body's internal biological clock falls out of alignment with the local time at a travel destination. It is most pronounced after long-haul flights that cross several time zones rapidly, particularly in an eastward direction. Symptoms include persistent fatigue, difficulty sleeping at appropriate local times, impaired concentration, digestive issues, and general malaise. For business travellers making time-sensitive trips, jet lag can substantially affect performance in meetings and negotiations. Recovery typically takes one day per time zone crossed, though various strategies — including light management, hydration, and sleep adjustment — can accelerate adaptation.
Why it matters
For business travellers, jet lag affects performance at exactly the time it matters most — in the meetings, negotiations, or presentations that justified the trip. A senior leader who lands in a critical market severely jet-lagged and performs below their best has effectively wasted the cost of the flight and the opportunity. Travel programmes that factor in recovery time for major time-zone crossings — building arrival-before-meeting buffers into scheduling guidance — protect the value of the trip investment.
How it works in practice
Mitigation strategies include pre-trip circadian adjustment (gradually shifting sleep and meal times in the days before departure), strategic napping during the flight, light exposure management at the destination, hydration, and avoiding alcohol and heavy meals on the aircraft. Some organizations and individuals use melatonin to support circadian adjustment, though effectiveness varies. For eastward intercontinental journeys of more than six hours of time zone difference, arriving at least one day before high-stakes commitments is the most reliable mitigation.
The takeaway
Build jet lag risk into trip scheduling guidelines for major intercontinental routes. The commercial premium of arriving the day before critical meetings — one supplementary hotel night — is typically small relative to the performance risk of placing key people in critical situations while still desynchronized. Make this guidance available to travellers and their managers, who often make the scheduling decision without fully accounting for travel recovery time.