What should you know about reason for jet lag?

Your circadian rhythm coordinates alertness, body temperature, digestion, and the release of sleep-related hormones. Crossing several time zones moves the clock on the wall faster than this rhythm can adapt. Eastward travel often makes an earlier bedtime difficult, while westward travel can make it hard to wake at the new local time. Daytime sleepiness, difficulty sleeping at night, reduced concentration, and headache can accompany the adjustment. Poor sleep during the journey, dehydration, alcohol, and an irregular schedule may make symptoms feel stronger. Jet lag is different from ongoing insomnia because it follows a time-zone change and generally improves as the body clock realigns.

Use the destination's clock when practical: choose local meal and sleep times, seek daylight during the part of the day that supports your new schedule, and keep evening light subdued when preparing for sleep. Gentle movement, regular fluids, and a calm bedtime routine can help. Avoid using long daytime naps to compensate, because they may reduce sleep pressure at night. If sleep trouble continues after the travel adjustment, discuss appropriate insomnia management with a clinician. A travel health consultation can help when a trip is complex, you have a medical condition, or you take medicines whose timing matters.

Arrange medical advice if sleep disruption or daytime sleepiness persists beyond the expected adjustment period, repeatedly affects work or driving, or occurs without recent time-zone travel. Seek urgent help for severe confusion, fainting, chest pain, serious breathing trouble, or a sudden severe headache. Do not drive when you are struggling to stay alert.

Ask which light exposure and sleep timing fit your travel direction, whether a medicine or supplement could worsen drowsiness, and how to protect safety if you must drive or work soon after arrival.