Definition
Jet lag is the temporary mismatch between the body’s internal clock and the external environment after rapid travel across time zones. It is a real physiological state, not weakness.
Why it matters
Managing jet lag well is a small case study in circadian biology anyone can apply.
The Science
Eastward travel is harder than westward because advancing the clock is more difficult than delaying it. Strategic light exposure, timed melatonin, meal timing, and gradual pre-adjustment shorten adaptation.
The NSI Perspective
NSI treats jet lag as an opportunity to practice with circadian levers you can use anywhere.
Clinical Implications
Simple, evidence-based protocols exist and are underused.
Practical Application
Bright morning light in the new location is often more useful than any pill.
References
- 1.Sack RL. Jet lag. N Engl J Med. 2010;362(5):440–447.