Andrew Huberman· PhD
There have been some studies showing suppressive effects of light on cortisol, but wavelength and time of day are key variables.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
There have been some studies showing suppressive effects of light on cortisol, but wavelength and time of day are key variables.
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The data unambiguously demonstrate an effect of light on the corticotropic axis that is dependent on time of day.
6.7 hrs. of 10,000 lux decreased baseline cortisol (stress hormone) by up to 25%