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.
I was reading recently about this glimpmphatic clearance of waste in the brain that occurs during sleep and uh there was an interesting figure in this paper showing that Every mammal puts its head down during sleep. And there's some cute pictures of pandas sleeping on their side. The giraffe apparently puts the top of its head down uh in order to presumably increase lymphatic clearance. But I could also imagine that resting one's head reduces energetic demands.
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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.
So maybe the reason why the brain clears out stuff and why that's an important part of sleep is for an energetic purpose, >> right?
Interestingly, this similar thing happens where the spaces between your brain cells actually increases and like sort of like a like actually like a like a filter the it increases and actually waste products can start clearing out of your brain.
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.