Melatonin for Jet Lag: Timing Matters
Jet lag is the one condition where melatonin has strong, consistent evidence. But taking it at the wrong time can shift your clock the wrong way. The exact protocol for eastward and westward travel.
Key takeaways
- Take 0.5–5 mg at the destination's bedtime (around 10 p.m. local) on arrival day and for 3–5 nights.
- For eastward travel, this advances your clock — the direction you need; start the night before departure if possible.
- For westward travel, melatonin is less critical; morning light avoidance and evening light exposure do more work.
- Taking melatonin at the wrong local time (e.g., afternoon) can shift your clock the wrong direction and worsen jet lag.
- Combine melatonin with strategic bright light: morning light after eastward flights accelerates adaptation.
What This Guide Covers
Jet lag is the one condition where melatonin has strong, consistent evidence. But taking it at the wrong time can shift your clock the wrong way. The exact protocol for eastward and westward travel. This guide walks you through what matters most, why it happens, and the practical steps with the best support behind them.
First, the foundation: take 0.5–5 mg at the destination's bedtime (around 10 p.m. local) on arrival day and for 3–5 nights.
Next, the details: for eastward travel, this advances your clock — the direction you need; start the night before departure if possible.
Then, the practical side: for westward travel, melatonin is less critical; morning light avoidance and evening light exposure do more work.
Another angle worth knowing: taking melatonin at the wrong local time (e.g., afternoon) can shift your clock the wrong direction and worsen jet lag.
Finally, the big picture: combine melatonin with strategic bright light: morning light after eastward flights accelerates adaptation.
Frequently Asked Questions
What exactly is melatonin for jet lag?
Jet lag is the one condition where melatonin has strong, consistent evidence. But taking it at the wrong time can shift your clock the wrong way. The exact protocol for eastward and westward travel.
How long until I see improvement?
Most of the strategies in this guide start showing effect within one to two weeks of consistent practice. Supplement- and device-based approaches vary more, so track your nights in a simple sleep diary and judge by weekly trends rather than single nights.
When should I see a doctor?
If the problem lasts more than a few weeks, disrupts your daytime functioning, or comes with warning signs such as breathing pauses, gasping during sleep, chest discomfort, or severe daytime sleepiness, it is time to consult a qualified healthcare professional rather than self-treating.