What should you know about heavy jet lag?

Your internal sleep-wake rhythm is guided by light, meal timing, and regular activity. After a long flight across time zones, that rhythm may signal sleep when local life expects wakefulness. You might have difficulty sleeping at night, wake early, feel sleepy during the day, or notice headache, irritability, poor focus, and appetite changes. Symptoms usually relate to the travel transition, but ongoing sleep problems may overlap with insomnia and deserve a separate review.

Adopt the destination’s meal and sleep schedule as soon as practical. Seek daylight at a sensible local time, keep naps brief, stay gently active, and drink fluids after the journey. Limit alcohol and avoid using caffeine late in the local day. Do not drive, swim alone, or operate machinery when very sleepy. A clinician or pharmacist can explain whether a sleep aid is appropriate; do not combine products casually. Travel health consultation can be useful before future trips.

Arrange medical advice if symptoms remain disabling after a reasonable settling period, repeatedly disrupt travel, or continue when your schedule is stable. Seek urgent help for chest pain, severe breathlessness, fainting, confusion, a sudden severe headache, one-sided weakness, or symptoms suggesting another acute illness. Persistent daytime sleepiness can make work and driving unsafe and should not be ignored.

Ask whether your symptoms fit jet lag or insomnia, how to time light exposure and caffeine, and whether medicines or melatonin are suitable for you. Mention your route, arrival time, sleep pattern, medical conditions, regular medicines, snoring, and any safety-critical work or driving.