Experts: Light Exposure, Not Melatonin, is Key to Beating Jet Lag

Experts are highlighting natural light exposure as the most effective strategy for overcoming jet lag, suggesting travelers reconsider relying solely on melatonin supplements. Jet lag, a disruption of the body's internal biological clock, can manifest as fatigue, insomnia, and concentration problems after crossing multiple time zones.

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Traveling towards the east is usually harder on the body because it requires advancing the biological clock, which is biologically more difficult than delaying it.

Neurologist Dr. Lynette Gogol explains that light directly resets the circadian clock, but its effectiveness hinges on precise timing. "Light is the strongest signal to the brain's master clock," she noted, emphasizing that incorrect light exposure can prolong jet lag, while proper timing accelerates recovery. For eastbound travel, morning light exposure helps advance the body's clock, aiding earlier sleep and wake times, while evening light should be dimmed before bedtime.

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Light directly resets the circadian clock, but timing is important. Getting light at the wrong time can prolong jet lag, while getting light at the right time speeds up recovery.

Conversely, traveling west benefits from late afternoon or early evening light exposure, which helps delay the clock, making later bedtimes feel more natural. Dr. Gogol stressed that the body adapts more easily with clear directional signals. She also pointed out that jet lag affects more than just sleep, impacting energy levels, mood, digestion, and mental sharpness due to the desynchronization of the internal clock with the local light-dark cycle.

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Jet lag occurs when your internal body clock falls out of sync with the local cycle of light and darkness at your destination. Light is the strongest signal to the brain's master clock, which is why jet lag affects more than just sleep. Energy, mood, digestion, and mental sharpness are often disrupted as well.

While some experts, like medical professional Kelsey Pabst, suggest low doses of melatonin (0.5-3 mg) to ease sleep transitions, they concur that light is the primary factor. Pabst also recommended using an eye mask to block out light, especially on overnight flights or when crossing six or more time zones, reinforcing the central role of light management in adapting to new time zones.

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Jet lag is primarily a light problem, not a sleep problem.