5. No caffeine post 2pm
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.
5. No caffeine post 2pm
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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.
try to cut yourself off from caffeine probably at least 10 or so hours before you expect to go to bed and you can just calculate back calculate that and try to limit it so the dose and the timing make the poison cut yourself off after maybe two or three cups of coffee coffee and then that timing component count yourself back C yourself off decaffeinated coffee not too bad if you find the right thing too if you need that fix
No coffee 6 hours before bed
final caffeine around noon
if you go to bed at 10: be mindful you may want to have your last couple coffee before noon or so so by the time your bedtime arrives you're good to go
How late is too late for caffeine?
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.