Which direction of travel typically causes more problems with jet lag?

• A. North to South
• B. South to North
• C. East to West
• D. West to East

Answer: (D)

Traveling from West to East typically causes more problems with jet lag due to the disruption of the body's circadian rhythm, which is the internal biological clock that regulates sleep-wake cycles. This direction of travel often results in a greater change in time zones in a shorter period, as moving eastward usually means crossing several time zones quickly.

When traveling from West to East, individuals must adjust their sleep schedule by advancing their internal clock. This shift can be more challenging for many people, leading to symptoms such as sleep disturbances, fatigue, and decreased alertness. The body's natural tendency is to operate on a 24-hour cycle, and an advance in time (for example, moving from a time zone that is several hours behind to one that is several hours ahead) requires more effort and time for adaptation compared to a delay in time, as experienced when traveling East to West.

Therefore, jet lag is often pronounced in this direction, making it important for travelers to plan for adjusting their sleep patterns while preparing for a journey from West to East.