Andrew Huberman· PhD
The great science of sleep in the past five or 10 years has been yes, quantity is important, but quality is just as important. And you can't have one without the other in terms of a good beneficial next day outcome.
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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.
The great science of sleep in the past five or 10 years has been yes, quantity is important, but quality is just as important. And you can't have one without the other in terms of a good beneficial next day outcome.
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you can't just get 4 hours of sleep that is incredibly good quality and get away with it but you also can't be in bed for 9 hours or 10 hours getting 7 hours of sleep but it's really bad quality of sleep you have to get both you can't short Change either one of those
you can't short Change on either, you can't say okay did he just tell me that I should not worry about how long I'm sleeping but as long so you can't just get 4 hours of sleep that is incredibly good quality and get away with it but you also can't be in bed for 9 hours or 10 hours getting 7 hours of sleep but it's really bad quality of sleep you have to get both you can't short Change either one of those
The great science of sleep in the past 5 or 10 years has has been yes quantity is important but quality is just as important and you can't have one without the other in terms of a good beneficial next day outcome. You can't just get 4 hours of sleep but brilliant quality of sleep and be unimpaired. nor can you get 8 hours of sleep but have very poor quality of sleep and be unimpaired the next day.
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.