East vs. West: Why Direction Matters
Your circadian clock advances (shifts earlier) at maximum 1 hour per day and delays (shifts later) at maximum 1.5 hours per day. This means westward travel is biologically easier — you're essentially staying up a bit later. Eastward travel requires advancing your clock, which is harder. A London to Tokyo flight (9 hours east) takes approximately 9 days to fully adjust without light intervention, or 4–5 days with the right protocol.
The goal on a long-haul flight is not maximum sleep — it's sleep timed to match your destination's night. Sleeping during your destination's daylight hours locks in the wrong circadian timing. Use a calculator to find when it will be 10 PM–6 AM at your destination, and try to sleep only during that window.
Light Therapy: The Most Powerful Jet Lag Tool
Light is the primary signal that resets the circadian clock. On arrival at your eastward destination: seek bright morning light (outdoor preferred) during the hours that correspond to 8–10 AM at your destination. Avoid bright light during hours that correspond to late evening at your destination. This single protocol, applied consistently for 3 days, reduces east-bound jet lag adjustment time by approximately 50%.
Melatonin Timing for Eastward Flights
0.5mg melatonin taken at 10 PM destination time for 3 nights after an eastward arrival accelerates clock advancement. This is the scientifically validated dose — the 5–10mg products in pharmacies are 10–20× higher than the physiologically effective amount. The melatonin doesn't put you to sleep; it signals to your clock that it's night at your destination, accelerating the adjustment.
- 1Pre-flight: shift your bedtime 30 minutes earlier per night for 3 nights before eastward travel.
- 2On the flight: use a sleep mask and earplugs — quality sleep on planes is possible but requires blocking light and sound.
- 3Arrival: stay awake until local bedtime (10 PM) on day 1, no matter what.
- 4Arrival days 1–3: get 30 minutes of outdoor light before 10 AM at your destination.
- 5Melatonin: 0.5mg at 10 PM destination time for 3 nights after arrival (eastward only).
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