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peter_hurford comments on Polyphasic Sleep Seed Study: Reprise - Less Wrong Discussion
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I'd just like to mention a shout-out for the sleep schedule Dual Core 1, which I think is even more easily sustained than Everyman.
I can add a +0.5 to this; one of my friends adapted to DC with very little fanfare or sleep deprivation.
This is good to hear, because 6hrs is definitely better than 8hrs. However, evidence of sustained cognitive performance quality is even more important to me on this sort of schedule, because we already know that many people on swing shifts (and in, say, grad school) seldom sleep more than six hours a day, and often in separate chunks, but we also know that both the short-term and long-term effects of this sort of chronic partial sleep deprivation are detrimental. If someone's only sleeping two-hours a day and is still able to talk, it seems much more likely that something strange and completely not understood is going on, and chronic partial sleep deprivation is not what's happening.
DC1 is different from DC (aka Segmented) is only a little shy of 5 hours (3hr core, 1.5hr second core, 20 min nap), not 6.
I think there's a fallacy here. It's possible Uberman might succeed enough to allow some cognition (and more than we might otherwise expect), but not optimal cognition.
Ah, my mistake about sleep length in DC1.
Sorry, I meant for "still able to talk" to stand in for the large group of things constituting "appear basically normal", which the standard literature suggests they should not.
I agree with you and believe in polyphasic sleep, but my point still stands -- one can "appear basically normal" without actually having optimal cognition.
Puredoxyk reports being able to do work while laying down, etc, which is basically impossible if you're seriously sleep deprived.