Andrew Huberman· PhD
There is also interesting data on short wavelength, light suppression and keeping cortisol low at night which is what you want at night.
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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.
There is also interesting data on short wavelength, light suppression and keeping cortisol low at night which is what you want at night.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
But if it's relatively bright to dim red light or amber colored light of the sort that you would get with an incandescent bulb as opposed to an LED bulb, that's going to keep cortisol low.
And of course, you should dim the screen on your phone and your computer. There's actually a way if you have an Apple phone that you can very easily program in a triple click shortcut so that your screen turns red. We can provide an instruction of how to do that in the show note captions. It takes about 2 minutes to do. I have this on all my phone devices. So you can triple click on the side and then it brings your phone screen uh from its standard uh luminance to a basically a red screen. So it cuts out all the short wavelength light.
10 minutes of bright outdoor light within the first hour of waking anchors the circadian phase and improves sleep onset that night.
Morning sunlight exposure shifts the cortisol awakening response forward, improving daytime alertness.
Long-term morning sunlight reduces age-related macular degeneration risk.
Sleep regularity predicts all-cause mortality more strongly than sleep duration.
Tracking deep sleep on a wearable accurately reflects EEG-measured slow-wave sleep.
Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.