Andrew Huberman· PhD
for me sleep actually has four macros and you can remember this by the acronym qqr T and it stands for quantity quality regularity and timing qqr T quantity quality regularity and timing
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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.
for me sleep actually has four macros and you can remember this by the acronym qqr T and it stands for quantity quality regularity and timing qqr T quantity quality regularity and timing
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uh how they are structured and interrelated uh you talked to us about the four macronutrients of good sleep quantity quality regularity and timing
there probably are four pillars of sleep there is probably regularity how consistent is your sleep schedule from are you undergoing what we call social jetlag which is where you're bouncing around you're going to sleep it you know 1 a.m. then 10 p.m. and all over the map so there's a sort of regularity there is the continuity of your sleep is it fragmented are you waking up many more times or is it just a nice one long shot that's a second feature I think the third feature is quantity how much sleep you getting and how much of the different stages of you get are you getting and then independent of how regular your sleep is how continuous your sleep is and the amount of the quantity the final is quality and quality is come big in the last five years in the sleep field in other words what is the electrical signature of your sleep
And then, finally, the part is regularity. This means going to bed and waking up at the same time no matter whether it's the weekend or the weekday. Go to bed at the same time, wake up at the same time. Those are the four key pillars that we know of for sleep.
And you can hold any three constant and manipulate one of them and you get a deficit.
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.