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.
because we learn best in these 90 minute bouts inside of one of these ultradian cycles. And I should repeat again, that within that 90-minute cycle, you should not expect yourself to focus for the entire period of one 90-minute cycle. The beginning and end are going to be a little bit flickering in and out of focus.
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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.
but that 90 minutes is about what the brain can handle in terms of a dedicated effort for high degree of focus.
the 90-minute time block seems to be the one in which the brain can enter a state of focus and alertness and do hard work and focus, focus, focus and then at about 90 minutes, there's a significant drop in your ability to engage in this mental or physical work.
They are offered to you at least twice every day and you can really learn to detect when they occur and when they're likely to occur.
how long about of cognitive work can or should be typically 90 minutes is going to be the upper limit before you take a break
So I recommend that they be spaced by at least 2 to four hours. And most people probably won't be able to handle more than two per day.