Explain this example better When traveling to a new time zone (e.g., New York to Italy), viewing light at the wrong time, such as early in the Italian morning after flying in from New York, can delay your clock and make you feel more in sync with your home time zone instead of the local one. To prevent this, ensure you understand your body's internal clock and use light exposure correctly

When traveling to a new time zone, like from New York to Italy, viewing light at the wrong time can significantly disrupt your circadian rhythm and delay your adjustment to the local time. Here's a clearer explanation:

Example Scenario

• Origin: New York
• Destination: Italy (6 hours ahead)
• Departure: Nighttime

Upon Arrival in Italy

1. Local Time: 8:00 AM
2. New York Time: 2:00 AM (your body's reference point)

Key Points

• If you arrive at 8:00 AM local time in Italy but it's 2:00 AM according to your New York circadian rhythm, your body still thinks it's very early morning.
• Viewing light early in the morning in Italy (equivalent to 2:00 AM New York time) will delay your circadian clock. This delay essentially means your body will still operate on New York time, making it hard to adapt to Italy's schedule. You'll be awake during the Italian night, feeling alert and unable to sleep.

Recommended Actions

1. Avoid Light: Upon arrival in Italy, you should avoid bright light exposure until it's consistent with your body's New York morning time. This prevents further delay of your internal clock.
2. Light Exposure Adjustment: Start viewing bright light at a time that aligns with morning light exposure back in New York (e.g., around 6:00 AM New York time, which is 12:00 PM Italy time).
3. Behavioral Adjustments: Besides adjusting light exposure, engage in other activities like exercising and eating on the local Italian schedule to help your body gradually align with the new time zone.

Andrew Huberman illustrates the consequences of incorrect light exposure and the importance of strategic light management during travel. This approach helps mitigate jet lag by properly aligning your circadian rhythm with the local time zone 1 2 3.