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.
If I measure your blood pressure before sleep and then after sleep at a matched circadian time... what we've discovered firstly is that the amount of deep sleep that you have measured in these big delta slow waves during deep non-REM sleep, that predicts how much of a drop in your systolic blood pressure you will have in the morning relative to the evening as if deep sleep provides a recalibration of the cardiovascular system.
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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.
No. Well, it's during deep sleep that you get this lowering of blood pressure, and we've got some data right now that we're about to publish that deep sleep provides actually a homeostatic recalibration of blood pressure.