What should you know about jet lag mean?

The brain’s timing system helps coordinate sleep, alertness, hunger, digestion, and hormone release. After a journey, that system may still signal night while the destination is bright and active, or signal morning when local people are asleep. Common effects include difficulty sleeping, early waking, daytime sleepiness, reduced concentration, headache, and appetite changes. Jet lag is different from ordinary tiredness because the schedule shift is central to the problem.

Switch meals, activity, and bedtime toward local time. Use daylight strategically, keep the sleep environment dark and quiet, and avoid alcohol close to sleep. Plan demanding tasks for times when you are most alert and take care with driving. If trips are frequent or symptoms are disruptive, a travel-health consultation can help match light and sleep measures to your itinerary.

See a clinician if symptoms are severe, continue well beyond the expected adjustment, or occur without recent time-zone travel. Seek urgent care for chest pain, severe breathing trouble, fainting, confusion, a sudden severe headache, or thoughts of self-harm. Persistent insomnia or sleepiness can require a separate evaluation.

Ask how to shift your schedule before departure, when to seek daylight after arrival, and whether your health conditions or medicines affect sleep advice. Ask how to recognise a separate sleep disorder.