How Professor Andrew Huberman Recommends Managing Jet Lag with Circadian Science

 Few things feel more disorienting than stepping off a long flight only to find your body insisting it’s midnight when the sun is high overhead. You want to be present for that business meeting or family dinner, but your brain feels stuffed with cotton, your digestion is off, and your mood is strangely fragile. Professor Andrew Huberman, who frequently travels between Stanford and research institutions worldwide, has developed a set of protocols based on circadian science that go far beyond the usual “drink water and get some sun” advice. His approach treats jet lag not as an unavoidable consequence of air travel, but as a predictable mismatch between your internal clock and external light cues—one that you can systematically correct using specific timing, temperature, and behavioral levers.

Why Your Body’s Master Clock Runs on a Slightly Longer Day

Before diving into fixes, Huberman explains the fundamental problem most travelers overlook. Your brain’s master clock, a tiny cluster of neurons called the suprachiasmatic nucleus, naturally runs on a cycle that averages about twenty-four hours and eleven minutes. This means your body has a slight tendency to delay, wanting to stay up a bit later and wake a bit later each day. When you travel west, you’re asking your clock to delay even further—which aligns with its natural drift, making westward travel generally easier. Eastward travel requires your clock to advance, or move earlier, which fights against your natural biology. Huberman notes that understanding this asymmetry alone helps explain why flying from New York to London feels brutal for most people, while the return trip often feels more manageable. The protocols change depending on which direction you’re heading.

The Non-Negotiable Rule About Sunlight Upon Arrival

Huberman calls sunlight the “primary time giver” for your circadian system, and he means it literally. Your retinal cells contain a special photopigment called melanopsin that does not help you see images—its sole job is to detect the presence of blue-enriched morning light and signal your master clock about the time of day. Upon arrival at your destination, Huberman recommends seeking bright outdoor light within the first thirty to sixty minutes of your local morning, ideally for ten to twenty minutes. This single action tells your brain that the new time zone’s morning has arrived. The mistake most people make is arriving in the morning and immediately checking into a dark hotel room to nap. That darkness signals your brain to stay on your home time zone, essentially cementing the jet lag you’re trying to escape.

How to Use Low Solar Angle for Afternoon Resets

Not all sunlight is equal in Huberman’s system. The angle of the sun relative to the horizon dramatically changes how your brain interprets the signal. Sunlight within the first hour after sunrise or the last hour before sunset passes through more atmosphere, containing a higher ratio of red and orange wavelengths relative to blue. This low-solar-angle light signals your brain that the day is beginning or ending, helping to anchor your peripheral clocks in your liver, muscles, and other organs. Huberman advises travelers to deliberately view low-angle sunlight in the late afternoon of their destination, ideally without sunglasses. This does not reset your master clock as powerfully as morning light, but it helps synchronize the many other clocks throughout your body that control digestion, hunger, and energy levels.

The Surprisingly Powerful Role of Meal Timing

Huberman points to research showing that your liver and digestive system have their own independent clocks that respond strongly to food timing. When you eat sends a powerful signal about what time of day it must be, separate from light signals. He recommends a specific protocol for jet lag: upon arrival at your destination, fast for at least twelve to fourteen hours before your first local breakfast. This means if you land in the morning, you skip breakfast and eat lunch as your first meal. If you land in the evening, you go straight to sleep and eat breakfast the next morning. The fasting period forces your liver clock to reset based on the new feeding time. Huberman acknowledges this feels difficult, especially after a long flight, but he notes that a single day of strategic fasting cuts jet lag recovery time by about half in most studies.

Why Temperature Contrast Wakes Your Brain Up

Here is a tactic most travelers have never considered. Your brain uses temperature changes as a secondary time cue, and Huberman has found that deliberate cold exposure upon arrival can trick your system into waking up. When you step off a plane feeling groggy at two in the afternoon local time, your brain thinks it’s the middle of the night based on your home schedule. Exposing your face, palms, and the bottoms of your feet to cold water for about thirty seconds triggers a rapid increase in epinephrine and core body temperature—both signals that your brain associates with morning wakefulness. Huberman recommends ending your arrival shower with thirty seconds of cool water, or simply splashing cold water on your face and palms. Conversely, if you arrive in the evening and need to wind down, a warm bath or shower signals your brain that the day is ending and sleep should follow.

Managing Light Exposure Before and During the Flight

Huberman argues that jet lag management actually begins before you board the plane. In the three days leading up to a long trip, he recommends gradually shifting your light exposure in the direction of your destination. For eastward travel, view bright light fifteen to thirty minutes earlier each morning. For westward travel, delay your light exposure later each evening. During the flight itself, he suggests wearing blue-blocking glasses or using the overhead light strategically. If you’re flying during what would be nighttime at your destination, keep your environment as dark as possible and wear an eye mask. If you’re flying during local daytime, expose yourself to as much bright light as possible, even opening your window shade to catch sunlight. The mistake many travelers make is watching bright seatback screens during what should be their destination’s nighttime, which actively suppresses melatonin and deepens the circadian disruption.

Using Caffeine as a Strategic Clock Resetter

Finally, Huberman discusses caffeine not as an energy crutch but as a precise tool for circadian shifting. Caffeine blocks adenosine receptors in your brain, which indirectly influences your master clock’s sensitivity to light. Taken in the first hour after waking at your destination, caffeine helps reinforce that new wake-up time as your brain’s new reference point. Taken after three in the afternoon at your destination, caffeine can delay your next night’s sleep and worsen jet lag. Huberman recommends keeping caffeine use to the first six hours of your new local day for the first two days after travel. He also notes a surprising finding from his lab’s review of the literature: a small dose of caffeine, about half a cup of coffee, taken thirty minutes before a strategic nap can help you wake from that nap feeling alert rather than groggy, making naps useful rather than disruptive.