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Matt Cardin's avatar

Fascinating stuff, Scott. I remember being deeply intrigued a decade or so ago when there was a burst of mainstream interest in this matter of segmented or biphasic sleep as it made the rounds in the popular press. The big revelation seemed to be that this is how much or most of the human race slept before the advent of the industrial age, and that, as you've pointed out in this post, we may well have lost something by coming to insist that a long span of unbroken hours represents the only "valid" way to envision human sleep patterns.

I recall reading a 2013 Harper's article on this subject by Dr. A. Roger Ekirch (https://harpers.org/archive/2013/08/segmented-sleep), who also wrote the 2016 paper "Segmented Sleep in Preindustrial Societies" (https://academic.oup.com/sleep/article/39/3/715/2454050) as well as an entire book looking at sleep patterns from the past.

See also the excellent 2016 AEON article "Broken Sleep" (https://aeon.co/essays/why-broken-sleep-is-a-golden-time-for-creativity).

Thank you for bringing this up. Especially since, in a mild bit of synchronicity, my own sleep has become more biphasic than usual, in a very pronounced way, over the past few nights.

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Ian @ Monetization Machine's avatar

Here's a nifty trick I use at 3 AM to receive information from the universe. Before bed, I fill the kettle in the kitchen with water because I use the six-minute boiling cycle as a meditation timer in the early morning hours like this:

I wake up around 3 - 3:30 AM and wander from the bedroom to the kitchen without opening my eyes.

I feel for the kettle and hit the power button. And then next, I assume what Qigong calls: 'dead man's posture.'

(Dead Man's Posture is cupped hands pulled into the lower stomach, knees slightly bent, and core pulled in—in other words: It's relaxed standing.)

All the while, the kettle is going through its six-minute cycle, so I shift my attention to the noise of the water boiling, open my mind and see what pops in, with one caveat. Often I go to bed and ask the universe to show me some options on specific stuff. And sometimes the answer pops out when I'm listening to the kettle boil at 3 AM.

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