Andrew Huberman· PhD
It doesn't matter if you went to bed at 2:30 AM, or you went to bed at midnight, you're getting up at the same time. It's actually critical for keeping sleep rhythms healthy.
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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.
It doesn't matter if you went to bed at 2:30 AM, or you went to bed at midnight, you're getting up at the same time. It's actually critical for keeping sleep rhythms healthy.
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a consistent sleep and wake time is critical if you're moving that around on a day-to-day basis it's going to be very hard for your body to know when the Melatonin Peak should come and when you should be having that cortisol Awakening response
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.