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Journal Club with Dr. Peter Attia | Effects of Light & Dark on Mental Health & Treatments for Cancer

Huberman Lab

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Understanding the Importance of Sunlight for Circadian Rhythms

The human circadian clock relies on two signals: low solar angle sunlight in the morning and evening. This helps maintain a stable sleep-wake cycle without drifting. The midday sun is considered a circadian dead zone as it cannot effectively shift the circadian clock due to its bright light triggering different ops and melanopsin. While viewing midday sun boosts mood and well-being, it does not anchor the sleep-wake cycle. The evolutionary purpose of color vision was initially for setting the circadian clock based on sunrises and sunsets.

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