3 ms·

From the public results only[1] (I don't have a copy of the whole study) they studied the following things looking for correlation with brain decline: * short

From the public results only[1] (I don't have a copy of the whole study) they studied the following things looking for correlation with brain decline: * short sleep duration * sleep quality * difficulty initiating sleep (DIS) * difficulty maintaining sleep (DMS) * early morning awakening (EMA) * daytime sleepiness They only found that the middle four were correlated. I don't know what exactly "sleep quality" is but the others are pretty easy to understand. And the point is that the duration of a person's sleep is not what mattered, it was the quality. [1]: https://www.neurology.org/doi/10.1212/WNL.0000000000209988 https://www.neurology.org/doi/10.1212/WNL.0000000000209988

digging 2y ago
Sleep quality, if excluding DIS, DMS, EMA, usually will refer to things like apneas, nasal congestion, digestion, noise or light in the room, etc. Disturbances that don't wake the person but do tax the brain.
- derefr 2y ago
  I would describe low sleep quality as "difficulty entering or maintaining the restorative phases of sleep." It's the thing a sleep clinic measures with an EEG.
deleted 2y ago
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timr 2y ago
Also, worth saying: these things were based on self-reported data, which is basically crap. >To estimate the effects of sleep quality on the brain, the researchers surveyed approximately 600 adults on how well they slept. The participants were asked the same questions five years later and underwent brain scans 10 years after this. This is press-release science. Maybe the latter three things you can remember, but I have sensors and whatnot in a fancypants mattress (i.e. I'm highly motivated to know), and my subjective opinion of my prior night's sleep is pretty uncorrelated with what they say. I couldn't begin to tell you the quality of my sleep from a week ago.
- fsckboy 2y ago
  self-reported data is basically crap as it regards actual sleep patterns, but it could (hypothetically) be a rock solid predictor of brain shrinkage
  - timr 2y ago
    You can't just take crap data and compare it to a hard outcome and claim victory if you find a correlation. Crap data is crap, no matter what you compare it to.
    - fsckboy 2y ago
      you're wrong. The only evidence we have for gravity is the correlation of mass and attraction. The theory of gravity does not contain any hint of a reason why, it simply points out what we can observe. Correlation is the only evidence we have. And you have not ruled out that complaining about sleep in various ways isn't a direct side effect of brain shrinkage so the hypothesis remains open.

digging 2y ago

Sleep quality, if excluding DIS, DMS, EMA, usually will refer to things like apneas, nasal congestion, digestion, noise or light in the room, etc. Disturbances that don't wake the person but do tax the brain.

derefr 2y ago
I would describe low sleep quality as "difficulty entering or maintaining the restorative phases of sleep." It's the thing a sleep clinic measures with an EEG.

deleted 2y ago

[deleted]

timr 2y ago

Also, worth saying: these things were based on self-reported data, which is basically crap. >To estimate the effects of sleep quality on the brain, the researchers surveyed approximately 600 adults on how well they slept. The participants were asked the same questions five years later and underwent brain scans 10 years after this. This is press-release science. Maybe the latter three things you can remember, but I have sensors and whatnot in a fancypants mattress (i.e. I'm highly motivated to know), and my subjective opinion of my prior night's sleep is pretty uncorrelated with what they say. I couldn't begin to tell you the quality of my sleep from a week ago.

fsckboy 2y ago
self-reported data is basically crap as it regards actual sleep patterns, but it could (hypothetically) be a rock solid predictor of brain shrinkage
- timr 2y ago
  You can't just take crap data and compare it to a hard outcome and claim victory if you find a correlation. Crap data is crap, no matter what you compare it to.
  - fsckboy 2y ago
    you're wrong. The only evidence we have for gravity is the correlation of mass and attraction. The theory of gravity does not contain any hint of a reason why, it simply points out what we can observe. Correlation is the only evidence we have. And you have not ruled out that complaining about sleep in various ways isn't a direct side effect of brain shrinkage so the hypothesis remains open.