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It's become apparent to me in the past few days that, when I wrote last week's post on the theory of sleep, I didn't know what I was talking about. Or rather, I had an incomplete picture of the subject at hand, and oversimplified a system that was more complicated than I was giving it credit for.

A little more digging has revealed that there is, in fact, evidence that SWS may be important for consolidating declarative memory, which breaks down into episodic memory (events) and semantic memory (facts). By contrast, REM consolidates procedural memory and spatial memory (both of which are more or less exactly what they sound like). Previously, I had dismissed it as "useless". Oops.

Of course, that's not the whole story, either: non-REM sleep is split into periods of "light sleep" and periods of SWS. Altogether, an 8-hour monophasic sleep cycle includes something like 1-2 hours of REM, 1-2 hours of SWS, and 4-5 hours of NREM2 light-sleep. The goal of the E3 schedule, then, isn't so much to absolutely reduce needless SWS, but to restructure the sleep cycles to reduce NREM2, at minimal cost to SWS/REM. (Note that E3 differs from other polyphasic schedules in this respect; notably, Uberman almost entirely eliminates SWS, and packs two hours of REM into just six short naps.)

Now, it makes intuitive sense that, if the brain is using SWS for consolidating certain types of memory, there's an additional "rest state" where it's actually doing nothing but resting. And so,

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After today's core, I feel tired. Not sluggish or droopy (yet), just a vague sense that I might rather be asleep than awake. It probably doesn't help that my naps yesterday were mixed up and haphazard, or that I went to bed with too much on my mind (which likely increased the amount of time it took to fall asleep. Of course, it's entirely possible that the higher-order bit is that I'm tired because I'm still not getting enough SWS.

Though, it's suspicious that I often feel very much better after my 8am nap. Perhaps it's simply circadian.

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I've noticed a recent change in the subject matter and timbre of my dreams. Warning: extreme pointless navel-gazing ahead.

Typically, I'm used to abstract, 'feeling-focused' dreams, where real people that I know appear as characters only when my brain needs to put a human face on something -- people I know tend not to appear as reasonable models of themselves. The scenarios, in general, are unrealistic, often fantastical, and perhaps deeply symbolic (though I've never been one to lay much stock in trying to interpret my or anyone's nighttime mental gymnastics).

Recently, though, I've experienced a string of 'concrete-feeling' dreams, where, so far as I can remember, I've been interacting with real(ish) characters in realistic(ish) social situations (e.g. X meets Y for the first time in a classroom, Z is having relationship trouble with A at a study group, B feels happy/sad/stressed and wants help at a nonspecific local restaurant), both from current life and past contexts. It appears that people that I have strong emotional responses to (positive or negative) tend

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Why should this polyphasic thing work at all? A fair question; I too was once skeptical. Here's a quick explanation, though, to approximately the best of my understanding.

Prevailing neurological understanding of sleep distinguishes between Rapid Eye Movement cycles (REM) and Slow-Wave Sleep (SWS): REM comes in brief bursts, but is crucially important to mental function and consciousness in complicate ways that we don't quite understand. SWS, on the other hand, appears to be a simple 'resting state' that allows the body to recover from the day's stress. Thus the 8-hour monophasic sleep cycle typically breaks down into:

As we subject our bodies today to much less physical stress today than was present in the ancestral environment, I think it's reasonable that modern-day, modern-living humans can healthily survive on less SWS than we evolved to desire. REM, on the other hand, is a complicated mess of complicated that we understand incompletely, if at all, and which it might be unwise to tamper with. Thus, the Everyman-3 schedule that my roommate and I are transitioning to retains six REM cycles, but cuts out much of the SWS:

The first segment is three hours of "core" sleep that covers three REM cycles; the remaining cycles are placed throughout the day in 20-minute naps (it turns out that 20 minutes is almost

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I'm blogging now? Apparently. Expect a hodgepodge mix of assorted things, roughly corresponding to the set of things I'm interested in, in no discernible order. Maybe at some point, I'll get my act together and start composing sequences of posts, but for the initial brain-dump phase, expect no more than, well, a brain dump.

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Today, I begin transitioning to a polyphasic sleep schedule. If it works, I'll develop the ability to REM sleep in naps of twenty minutes, and survive on fewer hours of nighttime sleep by napping during the day. (The particular cycle I'm aiming for is "Everyman-3", three hours of night-sleep and three twenty-minute day-naps.)

Well, perhaps the word 'survive' is misleading. I'd like to do a lot better than 'survive'; I'd like to continue functioning at my present mental capacity, for extra conscious hours. While efficiency-times-duration calculations indicate that I should be willing to accept up to a 20% drop in efficiency along with the 25% increase in waking-hours, I suspect that the nighttime hours that I'll be awake will be less useful than the daytime hours I'd be taking a productivity-hit in, which means that an 20% hit is a loss. I'd like to see no more than a 5% dip in mental-function test scores, and if I see more than a 10% drop, I'm going to need to seriously evaluate the utility of being awake when everyone else is asleep.

My outcome expectations are as follows:

• 50% I give up before completing the transition
• 20% I observe significant mental-function decline post-transition
• 30% my test results exhibit no significant decline

Within the 30% chance of success, though, I expect a 1/3