How long does jet lag last?

Jet lag commonly improves as your body clock adjusts to the destination time zone, although recovery differs between travellers. Crossing more time zones, travelling east, sleeping poorly, and having an irregular schedule can make the adjustment feel harder. Symptoms may ease gradually rather than disappear after one night.

Your brain uses light, meals and activity to coordinate sleep and wakefulness. A flight across time zones moves the clock on the wall faster than this internal rhythm can change. As a result, you may feel sleepy during the day, wake at an inconvenient time, or notice headache, reduced concentration and appetite changes. These features fit [Jet Lag](/conditions/jet-lag/), but persistent sleep trouble can overlap with [Insomnia](/conditions/insomnia/).

Use the destination schedule soon after arrival: seek daylight at a suitable local time, keep meals near local mealtimes, and choose gentle activity when you feel alert. Keep the bedroom dark, quiet and cool at night. Avoid driving or safety-sensitive work when very sleepy. Hydration, regular food and limiting alcohol can also help you feel steadier. A [Travel Health Consultation](/treatments/occupational-and-travel-medicine/travel-health-consultation/) can help with planning for a demanding itinerary.

Arrange medical advice if sleep disruption continues well beyond the expected adjustment, repeatedly returns after travel, or interferes with work, driving or daily care. Seek urgent help for chest pain, severe breathing difficulty, fainting, new weakness, confusion or a sudden severe headache. Daytime sleepiness and difficulty sleeping can have causes other than travel, so do not assume every lingering symptom is jet lag.

Ask which light and sleep schedule fits your route, whether any medicine is suitable with your health conditions, and how to handle symptoms that persist. If insomnia remains after travel, ask whether [Insomnia Management](/treatments/lifestyle-and-wellness/insomnia-management/) is appropriate.