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.
But if you're somebody who struggles to find focus, definitely let your physiology and this rise in your body temperature support your efforts to focus rather than trying to do your best work at times of day when your physiology is actually directing your body and your brain toward de-focus and towards being more lethargic.
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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.
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What you're trying to do in this idea of optimizing this 90-minute work about to a particular time of day is catch the portion of the steepest slope of that temperature rise.
You can be reasonably sure that your best work is going to be done anywhere from four to six hours after your temperature minimum.
So if you're somebody who wakes up at 8:00 AM each morning, your temperature minimum is 6:00 AM, chances are you're going to want to start this work about somewhere around 10:00 AM or 11:00 AM.
That piece of data is your temperature minimum. If you're somebody who wakes up on average at 7:00 a.m., well then your temperature minimum is 5:00 a.m., you can be reasonably sure that your best work is going to be done anywhere from 4 to 6 hours after your temperature minimum.
What you're trying to do in this in this idea of optimizing this 90minute workout to a particular time of day is catch the portion of the steepest slope of that temperature rise.