Andrew Huberman· PhD
Adopting a polyphasic sleep practice, such as that of the "Uberman" schedule, is associated with worse sleep, worse task performance, worse mood, and worse mental and physical health outcomes.
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We can't find evidence that holds up here. Proponents are reasoning from mechanism or analogy rather than direct human data, and the most credible skeptics raise objections we can't dismiss.
Adopting a polyphasic sleep practice, such as that of the "Uberman" schedule, is associated with worse sleep, worse task performance, worse mood, and worse mental and physical health outcomes.
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not only that they weren't necessarily helpful, but they were actually really quite detrimental. And on almost every performance metric, whether it be task performance, whether it be physiological outcome measures, whether it even be the quality of the sleep that they were having, when they were trying to get it, all of those were in a downward direction.
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Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.