When to worry about daytime sleepiness with jet lag

Crossing time zones shifts your internal body clock away from the local day and night. You may feel alert at bedtime, wake early, or become sleepy when you need to function. Travel fatigue, dehydration, disrupted meals, alcohol, and an unfamiliar environment can add to the problem. Sleepiness should gradually become easier as your routine aligns with local time; ongoing symptoms may have another cause.

Use daylight and activity at the local time that matches your new schedule, keep meals and sleep times consistent, and drink water. Keep naps brief and earlier rather than sleeping through the day. Avoid alcohol and sedating medicines unless prescribed for you. Do not drive or make safety-critical decisions if you are struggling to stay awake. Speak with a clinician if symptoms interfere with work or travel plans.

Seek urgent care for fainting, severe confusion, chest pain, breathing difficulty, a severe headache with weakness, or inability to stay awake safely. Arrange medical advice if sleepiness is worsening, remains disabling after your schedule has had time to adjust, or is accompanied by loud snoring, gasping, fever, or unusual episodes of weakness. A clinician can check for illness, medicine effects, and other sleep problems.

Could another condition or medicine be adding to my jet-lag symptoms? How should I time light, naps, caffeine, or any prescribed treatment? When is it safe for me to drive and return to demanding work?