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Jet lag

Dysrhythmia circadiana e itinere · Jet lag (pásmová nemoc)

What it is

The body clock out of step with local time after crossing time zones — worse flying east — for about a day per zone.

Symptoms & signs

  • Poor sleep at night, sleepiness by day
  • poor concentration
  • indigestion
  • irritability

🚩 Get help if…

  • see a doctor soon Calf swelling or pain after a long flight
  • call 112 / 911 now Sudden breathlessness or chest pain after flying
  • see a doctor soon Fever after a trip to the tropics — not jet lag
  • see a doctor soon Sleep still disturbed 2 weeks after arrival

Where it strikes

Medical treatment

  • Shift sleep before travel
  • timed light exposure
  • melatonin at local bedtime
  • a short-acting sleeping pill occasionally

Natural & lifestyle

  • Morning light after flying east, evening light after flying west
  • drink water, limit alcohol
  • eat at local times

Emerging & experimental

  • Light-therapy glasses
  • timed-caffeine apps

Alternative, off-label & anecdotal

Approaches used outside the guidelines, with what their supporters report and what testing has found so far.

  • Melatonin — trials support it, especially flying east trials support
  • Timed caffeine — helps alertness early / small studies
  • Homeopathic jet-lag pills — anecdotal anecdotal / traditional

ICD codes