Which statement about jet lag is correct?

• A. A minor headache after airport transfer
• B. A form of jet propulsion technique
• C. A mismatch between internal clocks and local time causing fatigue; adaptation improves with time and exposure to light
• D. A mechanical issue with aircraft instruments

Answer: (C)

Jet lag happens when your body's internal clock, which governs sleep and wakefulness, isn’t aligned with the local time after crossing multiple time zones. This circadian mismatch produces fatigue, sleep disturbance, and other symptoms as the body takes time to re-synchronize with the new day-night cycle. The fix is to help the body re-entrain to the destination’s schedule, with exposure to the appropriate light and a consistent sleep-wake pattern. Light is a powerful cue for resetting the clock, and timing matters: getting morning light can help advance the tempo after eastward travel, while evening light can help delay it after westward travel. The other statements describe something unrelated to jet lag: a minor headache after travel, a propulsion technique, or a mechanical issue with aircraft instruments.