Segmented Sleep: Roger Ekirch's First Sleep to Buckminster Fuller's Naps

SPEAKER_1 (0:00)

Imagine waking up at 3 in the morning. You open your eyes, the room is pitch black, and instantly, you get that familiar knot of anxiety tightening right in your chest.

SPEAKER_2 (0:12)

Oh yeah, we have definitely all been there.

SPEAKER_1 (0:14)

Right, like you look at the clock, you calculate exactly how many hours you have left before the alarm goes off, and you just start stressing out, because you're staring at the ceiling, completely failing at getting a normal, healthy eight hours of sleep.

SPEAKER_2 (0:28)

Exactly, you toss, you turn, you basically just panic about how exhausted you're going to be tomorrow.

SPEAKER_1 (0:34)

Yeah, but what if I told you that this 3 a.m. wake up isn't like a disorder at all? What if it's actually an ancient biological rhythm trying to break through your modern habits?

SPEAKER_2 (0:44)

I mean, it really forces us to completely re-evaluate what we consider a good night's rest, because we are so culturally conditioned to view sleep as this single unbreakable block of time.

SPEAKER_1 (0:55)

Right, like if you wake up, you assume you've broken it.

SPEAKER_2 (0:58)

Exactly. But that expectation is a surprisingly recent invention in human history.

SPEAKER_1 (1:03)

And that is exactly what we are getting into today. Our mission for this deep dive is to explore the world of polyphasic sleep, which basically means sleeping in multiple periods over a 24-hour cycle rather than just one long block.

SPEAKER_2 (1:16)

It is a massive topic.

SPEAKER_1 (1:17)

It really is. So we're going to explore the forgotten history of how humans used to sleep. We'll look at the intense modern subcultures trying to hack their biology for ultimate productivity, and examine what extreme environments, like sailing across the ocean or living on a space station, can actually teach us about the science of rest.

SPEAKER_2 (1:35)

There is a lot to cover.

SPEAKER_1 (1:36)

There is. Okay, let's unpack this because to understand why waking up in the middle of the night feels so natural to some people, we have to rewind the clock way back to a time before the industrial revolution, and more importantly, before the invention of electric lighting.

SPEAKER_2 (1:51)

That's really the turning point.

SPEAKER_1 (1:52)

Yeah. But first, help me out with the terminology here, because we hear words like monophasic and biphasic thrown around a lot. What do they actually mean?

SPEAKER_2 (2:01)

Right. So to set a clear baseline, most of us today practice what is called monophasic sleep, mono meaning one. So one big chunk of sleep at night.

SPEAKER_1 (2:10)

Okay, that's the standard eight hours.

SPEAKER_2 (2:12)

Exactly.

Then you have biphasic sleep, which is often called segmented sleep. This just means your daily rest is divided into two distinct blocks.

SPEAKER_1 (2:21)

Got it.

SPEAKER_2 (2:22)

And when you move beyond two periods, that's when you enter the territory of polyphasic sleep.

SPEAKER_1 (2:27)

Where did that term even come from?

SPEAKER_2 (2:29)

Well, that specific term was coined back in the early 20th century by a psychologist named JS. Szymanski.

He was meticulously observing how daily activity patterns fluctuate in animals and humans. And he needed a word for these multi-phase sleep cycles.

SPEAKER_1 (2:45)

Okay. So if monophasic sleep, that single eight-hour block is what we do now, what is the actual proof that we used to do something different? I mean, how do we know people weren't just, you know, sleeping through the night centuries ago?

SPEAKER_2 (2:57)

We actually have a massive historical record proving otherwise, largely thanks to a historian named A. Roger Ekirch.

SPEAKER_1 (3:04)

Oh, right. I read about his work. Yeah.

SPEAKER_2 (3:06)

He spent years digging through archives, and he analyzed over 500 historical references from the ancient, medieval and modern worlds.

SPEAKER_1 (3:15)

Wow. 500

SPEAKER_2 (3:16)

Yep. We are talking about diaries, court records, medical texts, literature.

He found that Western civilization overwhelmingly practiced segmented biphasic sleep.

SPEAKER_1 (3:28)

That's wild.

SPEAKER_2 (3:29)

It was just the accepted reality of life.

They even had specific universal names for it. You had your first sleep and your second sleep.

SPEAKER_1 (3:37)

Wait, so they would go to sleep, wake up in the middle of the night, and then just go back to sleep every single night?

SPEAKER_2 (3:43)

Every night. I mean, people would generally go to sleep early, not long after dusk. They'd sleep for several hours and then wake up right around midnight.

SPEAKER_1 (3:50)

Okay, but here is the key difference, right? They wouldn't panic about being awake like we do.

SPEAKER_2 (3:55)

Not at all. There was this completely normalized period of wakefulness that usually lasted about an hour or so, sandwiched right there between the first and second sleep.