Andrew Huberman· PhD
if we were in complete darkness, living in a cave with no artificial lights whatsoever, or we were in complete brightness where we never experienced any darkness, these rhythms of cortisol and melatonin would continue
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
if we were in complete darkness, living in a cave with no artificial lights whatsoever, or we were in complete brightness where we never experienced any darkness, these rhythms of cortisol and melatonin would continue
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In fact, if we were in complete darkness, living in a cave with no artificial lights whatsoever, these rhythms of cortisol and melatonin would continue. So if you were in complete darkness, it would happen once per 24 hour cycle, but it would be somewhat later and later each day.