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1465Re: Pepys's sleep - "It seems that, thanks to the light bulb, the entire industrialized world is sleeping unnaturally"

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  • Terry
    Aug 31, 2013
      Wikipedia on board: Segmented sleep, also known as divided sleep, bimodal sleep pattern, bifurcated sleep, or interrupted sleep, is a polyphasic or biphasic sleep pattern where two or more periods of sleep are punctuated by periods of wakefulness. Along with a nap (siesta) in the day, it has been argued that this is the natural pattern of human sleep.[1][2] A case has been made that maintaining such a sleep pattern may be important in regulating stress.


      --- In pepysdiary@yahoogroups.com, terry foreman <terry.foreman@...> wrote:
      > 'Dreamland': Open Your Eyes To The Science Of Sleep
      > by Maureen Corrigan <http://www.npr.org/people/4529709/maureen-corrigan>
      > http://www.npr.org/2012/08/07/158087512/dreamland-open-your-eyes-to-the-science-of-sleep
      > "One particularly fascinating sleep fact that [the author of *Dreamland*]
      > reports is that the sleep rhythms of the human brain have fundamentally
      > changed over the centuries. Medieval literary texts, medical manuscripts
      > and tales make reference to a mysterious "first sleep" and "second sleep."
      > The "first sleep" began shortly after sundown and lasted until after
      > midnight. When people woke up, they would pray, read, have sex, whatever.
      > The "second sleep" then lasted until sunup. In experiments, researchers
      > have found that when people live solely by natural light, they revert back
      > to this ancient "segmented sleep" pattern and that, chemically, the body in
      > that interval between first and second sleep is "in a state equivalent to
      > what you might feel after spending a day at the spa." It seems that, thanks
      > to the light bulb, the entire industrialized world is sleeping unnaturally."
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