Andrew Huberman· PhD
the retinal neurons that set your clock respond best to blue-yellow contrast, which is abundant in low solar angle sunlight. True even through cloud cover.
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the retinal neurons that set your clock respond best to blue-yellow contrast, which is abundant in low solar angle sunlight. True even through cloud cover.
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Viewing low solar angle sunlight in the morning is the best stimulus for setting your circadian clock because the retinal neurons that set your clock respond best to blue-yellow contrast, which is abundant in low solar angle sunlight.
The chromatic features of low solar angle sunlight are uniquely and relevant for circadian clock setting. Again however, the sun is the best “lamp”.
Even w/cloud cover when it’s not perceptible it’s still there & is more effective than any artificial light*
These two signals average so that your clock stays stable You Don't Drift meaning you're not waking up earlier every single day or going to sleep later every single day
Low solar angle sunlight even on cloudy days is distinctly different for this system than when the sun is overhead