How long does it take to recover from jet lag?

Recovery time varies, but a general rule of thumb is about one day per hour of time zone difference. For significant travel, like crossing 9 time zones, this could mean up to 9 days to fully adapt. Short trips (3-4 days) may still require several days of recovery after returning.

What are the main strategies to combat jet lag?

Key strategies involve managing light exposure (seeking sunlight upon arrival, avoiding blue light before bed), adjusting sleep schedules, timing meals around the new time zone, and exercising. Melatonin supplements can also help regulate sleep-wake cycles.

Is eastward travel worse than westward travel for jet lag?

Eastward travel is generally considered worse because it requires you to advance your body clock (go to sleep and wake up earlier), which is more difficult for most people than delaying it (staying up later), as is often required with westward travel.

How does jet lag affect decision-making and mood?

Jet lag, combined with sleep disruption, significantly impairs willpower and decision-making abilities. It can lead to cravings for unhealthy foods, increased grumpiness, mood swings, and a general feeling of being 'off' or experiencing 'primal instincts' due to hormonal and cognitive disruptions.

What is the recommended limit for international travel to protect health?

The discussion suggests that the current norm of frequent international travel is damaging. A 'safer' approach recommends no more than one 3-4 day trip every 90 days. Any travel beyond this frequency, especially monthly, puts you in a high-risk category similar to shift work.

Can naps help with jet lag?

Naps can be helpful and even 'game-changing' for rejuvenation, especially longer ones (around 60 minutes) that allow for deep sleep, though they can sometimes disrupt established sleep cycles if not managed carefully.

Are there any medications or supplements that can help with jet lag?

Besides melatonin, other pharmacological interventions are being explored, including extended-release melatonin, Medapanil (for alertness), melatonin receptor agonists, and orexin receptor blockers, which are non-habit forming and may help protect sleep architecture. Stimulants like caffeine can be used judiciously, especially if landing in the morning.

Jet Lag, Poor Sleep, and Melatonin | Bryan Johnson Podcast

Bryan Johnson

Education4 min read59 min video

Jul 18, 2025|72,714 views|1,746|289

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Key Moments

TL;DR

Jet lag significantly impairs performance and health; minimize international travel and prioritize light, sleep, and exercise.

Key Insights

International travel and disrupted sleep severely impact cognitive function, mood, and physical health.

Circadian rhythms are primarily regulated by light exposure, impacting hormone production and bodily functions.

Eastbound travel is generally more disruptive than westbound due to the body's natural tendency to delay sleep.

Strategies like strategic light exposure, consistent meal timing, and exercise can mitigate jet lag symptoms by shortening adaptation time.

Excessive international travel, particularly short trips across multiple time zones, carries significant health risks comparable to shift work.

Cultural norms often overlook the detrimental effects of compulsive travel, leading individuals to underestimate the damage to their well-being.

THE DAMAGING EFFECTS OF INTERNATIONAL TRAVEL

International travel, especially when combined with inadequate sleep and significant time zone shifts, can lead to a marked decline in cognitive function, mood, and overall physical well-being. Bryan Johnson's personal experience from an 11-day trip highlighted symptoms like brain fog, grumpiness, and cravings for unhealthy foods, illustrating how travel can diminish willpower and lead to poor decision-making. This degradation can be severe enough to impact performance in both personal and professional spheres, mirroring the consequences faced by elite athletes who lose competitive edges due to insufficient recovery from jet lag.

UNDERSTANDING CIRCADIAN RHYTHMS AND JET LAG

Human circadian rhythms, our internal biological clocks, are deeply ingrained evolutionary responses to the sun's light-dark cycle. Light, particularly blue light detected by the eyes, signals the suprachiasmatic nucleus in the brain to regulate these rhythms, influencing sleep-wake patterns, hormone release, and metabolic processes. Traveling across time zones disrupts this natural synchronization, causing the body to function on a misaligned schedule. This mismatch, often taking up to a day per hour of time difference to resolve, leads to the disorientation and dysfunction characteristic of jet lag.

THE SCIENCE BEHIND THE DISRUPTION

When the body's circadian rhythm is thrown off, it can trigger a cascade of disruptions. Hormonal balances, such as those of testosterone and cortisol, which naturally fluctuate throughout the day, become imbalanced. The digestive system, also operating on a circadian cycle, becomes confused about meal timing, leading to inefficiencies and discomfort. Furthermore, sleep deprivation and circadian misalignment significantly impair cognitive functions, reduce willpower, and increase susceptibility to illness. These cumulative effects can manifest as increased inflammation, a higher risk of diabetes, cardiovascular disease, and even affect mood and mental clarity.

STRATEGIES TO MITIGATE JET LAG

While complete avoidance of jet lag is unlikely, certain strategies can significantly shorten its duration and reduce its severity. Maximizing exposure to natural sunlight upon arrival in the new time zone, especially in the morning, helps recalibrate the body's internal clock. Conversely, avoiding blue light exposure in the evening, using blue-light blocking glasses, and dimming artificial lights can signal the body to prepare for sleep. Incorporating exercise and eating meals at appropriate times in the new time zone also aids in this adaptation process. Melatonin supplementation, taken strategically, can further assist in resetting sleep patterns.

JUDICIOUS TRAVEL: SETTING REASONABLE BOUNDARIES

The conversation emphasizes that while interventions can help, the sheer impact of significant time zone shifts is substantial. Cultural norms often encourage relentless travel without accounting for the health costs. A key takeaway is the concept of establishing a 'travel budget' for international trips. For short stays (3-4 days), traveling once a month across significant time zones is presented as an absolute limit, potentially requiring one to two weeks for full recovery. More moderate approaches suggest once every 60 days, with once a quarter being a more sustainable and safer frequency to avoid chronic disruption.

THE LONG-TERM CONSEQUENCES AND CULTURAL SHIFT

The cumulative effect of frequent international travel and sleep disruption can lead to serious long-term health issues, akin to those seen in shift workers, including increased risks of chronic diseases and reduced longevity. The discussion advocates for a cultural shift where the detrimental effects of excessive travel are recognized and discussed openly, rather than being seen as a badge of honor or a necessary evil. Establishing clear expectations and boundaries around travel can protect individual health, improve overall performance, and benefit workplaces and investors by ensuring employees are functioning optimally.

OPTIMIZING TRAVEL PROTOCOLS

For those who must travel internationally, focusing on core principles is crucial. This includes avoiding blue light on planes and upon arrival, practicing intermittent fasting during travel to align meals with the destination time, and aiming for sufficient sleep, potentially incorporating strategic naps if they are restorative. Pharmaceutical aids like melatonin can be beneficial, especially when combined with extended-release formulations for sustained effect. While stimulants like caffeine can be used cautiously upon morning arrival, they should be avoided later to prevent sleep disruption, with cold therapy and other methods offering alternative ways to boost alertness.

Mentioned in This Episode

●Supplements

●Products

●Tools

●Studies Cited

●Concepts

●People Referenced

Jet Lag Mitigation & Travel Guidelines

Practical takeaways from this episode

Do This

Wear blue light blocking glasses on flights and avoid screens before bed.

Seek sunlight exposure immediately upon arrival in the new time zone.

Exercise in the morning in the new time zone.

Eat meals according to the new time zone.

Consider melatonin supplements in the evening at destination bedtime.

Incorporate strategic naps (if they work for you and don't disrupt nighttime sleep).

If landing in the morning, consider caffeine or other stimulants judiciously.

Use cold exposure (e.g., cold shower) in the morning to boost a natural cortisol response.

Avoid This

Don't travel if you are sick.

Avoid blue light exposure in the evening or 1-2 hours before bedtime in the new time zone.

Don't consume heavy, unhealthy foods that can disrupt digestion.

Avoid drinking stimulants late in the afternoon or evening at your destination, as it can disrupt sleep.

Don't rely solely on interventions; acknowledge that some level of jet lag is likely.

Don't travel internationally more than once a month, and ideally less, to minimize cumulative damage.

Avoid multiple short international trips, as this is closer to detrimental shift work.

Recommended International Travel Frequency

Data extracted from this episode

Frequency Category	Max Trip Duration	Time Between Trips	Time Zone Difference Consideration
Extreme (High Risk)	3-4 days	1 trip per month	Any significant time zone change
Moderate	3-4 days	1 trip every 60 days	Any significant time zone change
Safer	3-4 days	1 trip every 90 days	Any significant time zone change
Tolerable (Personal Experience)	N/A	Once per quarter	3+ time zones (e.g., East Coast from West Coast)

Common Questions

Jet lag occurs when your body's internal circadian rhythm is out of sync with the new time zone you've traveled to. This happens because your body's natural clock is primarily regulated by light exposure, and rapid travel across multiple time zones disrupts this cycle, leading to fatigue, cognitive issues, and mood disturbances.

Topics

Travel Budget Light Therapy

Mentioned in this video

toolEurope trip

An 11-day international travel experiment Brian Johnson and Kate undertook, which led to a significant decline in physical and mental performance due to lack of sleep and jet lag.

toolCold therapy

A method of exposure to cold temperatures, such as cryotherapy or cold showers, which can help eliminate feelings of jet lag temporarily by releasing epinephrine and cortisol.

studyOlympic athletes study

A study involving 173 Olympic teams across 15 games, which found that athletes who did not recover from circadian rhythm adaptation could drop from gold to silver medal performance.

supplementMedapanil

A medication with a long half-life that can help activate dopamine, keeping individuals awake and alert. It's mentioned as a potentially helpful intervention for jet lag, particularly for extended alertness needs.

conceptBlue light

A type of light that affects the circadian rhythm by hitting the back of the eyes and activating the suprachiasmatic nucleus, a key driver of the body's internal clock. Exposure to blue light, especially in the evening, can delay melatonin production.

otherBlueprint