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.
This means that we should strive for a regular amount of sleep. And for some of us that means falling asleep and waking up and going back to sleep. For some people means falling asleep and waking up and not getting back to sleep.
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.
so not only is it bad not to get enough sleep not only is it bad if the insufficient sleep is fragmented but the worst is if it's fragmented unpredictably
So the continuity of your sleep is poor. It's not continuous. It's fragmented. And even if you get eight hours of sleep in a nine-hour period but it's fragmented versus you get eight hours of sleep all in a nice one bout within eight hours, so in both of those scenarios, it's the same duration of sleep, maybe it's even the same electrical quality of sleep, but if it's fragmented and littered and punctured with many awakenings, the continuity of sleep is poor. And that's not good either.
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.