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.
A great way to increase the amount of slow wave deep sleep (and the associated growth hormone release) you get in the first hours of sleep is to take a hot shower or bath one hour before going to sleep but after, rinse off in temperature neutral (not hot, not cold, just neutral temp) water.
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.
they were able to improve the amount of deep sleep by almost 40 minutes in some individuals what was the protocol there as I recall I think they were in the bath for somewhere around or the bath duration time was somewhere around 30 minutes but they were doing sort of segments where it was maybe it was 40 minutes 10 minutes in and then you could sort of get out I think the temperature because it was UK was around about 40° celsus somewhere in that region
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.