Blue Light, Circadian Rhythm & Sleep: What Actually Works.

14 Feb 2026 · 1 min
1:29

Ben Greenfield demonstrates Blue Sync, a wearable that filters sunlight to boost circadian rhythm stimulation. The device claims 40 minutes of wear provides the same circadian benefit as 60 minutes of unfiltered daylight, but with damage equivalent to only 20 minutes. It removes red wavelengths while adding blue light to increase alertness without the retinal damage concern that Dr. Wunsch raised.

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