Bryan Johnson· Author
I'll go to sleep at 8 pm, wake up at 1 am, and then go back to sleep around 4 am.
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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.
I'll go to sleep at 8 pm, wake up at 1 am, and then go back to sleep around 4 am.
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.
I'm typically in bed for 9 hours a night and my average sleep time for the past 6 months is 8 hours and 34 minutes
my six month sleep time average is 8 hr 42 min
Logged my worst sleep score in 4 years from nine days of international travel and a full schedule. Averaged 5.5 hrs a night versus 8.5.
my sunday 8h 06m sleep up at 5:30 am
Sleep score: 73% 💙 score: 100% https://t.co/w9NnutPTS0
8 hr 36 min of sleep
. 8:30 pm asleep (2+ REM, 2 deep) . 4:30 am wake
Saturday 5:00 am - I feel restored and energetic. 97% sleep score today.
I on my sleep stats for the past 12 months, I've averaged 8 hours and 35 minutes per night. That's uh 94% sleep efficiency, 3 hours and 54 minutes average of restorative sleep. That's REM and deep. My recovery is 69% and my HRV is 48.
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.