What is jet lag?

Jet lag refers to the physiological disorder caused by the mismatch between the human body's biological clock and the time at the destination after traveling across different time zones. It mainly manifests as insomnia, fatigue, loss of appetite, etc. The core content includes the causes of jet lag, symptom manifestations, adjustment methods and auxiliary tools. In terms of primary and secondary structure, causes and symptoms are basic knowledge, adjustment methods are the focus, and auxiliary tools are supplements.

Causes and symptoms of jet lag

Jet lag results from the disconnect between the body's biological clock (circadian rhythm) and the external light cycle. When rapidly crossing multiple time zones, physiological functions such as melatonin secretion and temperature regulation in the body cannot adapt simultaneously, leading to symptoms such as difficulty falling asleep, daytime sleepiness, and decreased concentration. Research shows that flying east (advancing time) is more difficult to adapt to than flying west. Common symptoms last 2-7 days and are related to age and individual differences.

Scientific method to adjust biological clock

Gradually adjusting your schedule is the core strategy: advance/postpone your sleep time by 1-2 hours 3 days before departure; move around according to local time immediately after arrival, and spend more time in the sun during the day to suppress melatonin secretion. For short trips (<3 days), it is recommended to maintain the original schedule to avoid aggravating the disorder. Harvard Medical School recommends avoiding long naps (≤30 minutes) and having a light dinner to reduce digestive burden.

Auxiliary tools and precautions

Melatonin supplements (0.5-5mg/time) or sleep aids (doctor's guidance is required) can be used in the short term, but long-term dependence is not recommended. Drink more water and less caffeine during the flight. Some technological products such asPhilipsblue light glasses,TimeshifterAPP can assist adjustment through light management. The elderly and patients with chronic diseases should be cautious and consult a doctor if necessary.

Summary and life suggestions

Jet lag is a short-term physiological reaction, and most people can recover naturally. Scientific work and rest combined with light management is the key, and auxiliary tools must be used rationally. People who frequently cross time zones (such as pilots and business people) are recommended to establish a regular adaptation plan. If symptoms persist for more than 2 weeks, sleep disorders or other illnesses may need to be investigated.

Quote sources:
1. Harvard Medical School Sleep Medicine Report (2021)
2. National Sleep Foundation's "Jet Lag Management Guide"
3. Phototherapy product description on Philips official website
4. Natrol official website melatonin usage recommendations