Sleep apnea

erentz 3 months ago

Slightly tangential to the study here but I’ve been going down the sleep apnea rabbit hole in recent months and I strongly encourage folks to investigate their sleep. A lot of people have sleep apnea and don’t realize it. You don’t have to snore to have it. A surprising statistic I found was 20-30% of people with ADHD have sleep apnea. A lot of people may be treating symptoms of sleep apnea like ADHD and high blood pressure with medications while ignoring the root cause. My experience with this has been that doctors are surprisingly ignorant. They’ll happy prescribe you medications for anxiety, ADHD, blood pressure for years, and never think to ask you about your sleep. Do some of your own investigations or ask about it if you have any suspicions.


copperx 3 months ago

I’m going to add myself as a data point. After suffering years of feeling sleepy regardless of how much I slept and frequently unmotivated and withdrawn, I was diagnosed with severe sleep apnea. A few years ago I was given Dexedrine, Ritalin, Adderall, and I even tried self-medicating with modafinil to ameliorate the symptoms of what doctors thought was ADHD with varying levels of success; but the drug-free treatment of sleep apnea with a BiPAP machine got rid of all of these issues; in addition, I feel about ten years younger.

— Sleep and Mortality: A Population-Based 22-Year Follow-Up Study (2007)

— Hacker News



2018.05.09 Wednesday ACHK

技術細節 3

親歷其境 3

這段改編自 2010 年 4 月 18 日的對話。



— 尼采













1. 應用


2. 傳播




3. 研究


— Me@2018-05-05 10:06:15 AM


Know the subject—At the Dale Carnegie public speaking class, which I highly recommend—they say anyone can make a good speech if he or she has _earned the right_ to speak on the subject in question. How do you earn the right? By living through the subject or by doing extensive research on it—which is arguably another form of living through it. Same principle applies to how-to writing. You cannot do high school student research. That is, find 21 facts and write an essay that consists solely of those 21 facts. Rather you need the proverbial iceberg of unused facts under the “tip” that is your book. The good news is virtually everyone has lived through something that fits that criterion. And, with a year or so, we can all research something that interest us to the point where we can write about it. The key to bad writing is assigned topics—the standard of high school and college teachers.

— John T. Reed



2018.05.06 Sunday (c) All rights reserved by ACHK

The Sixth Sense, 3

Mirror selves, 2 | Anatta 3.2 | 無我 3.2


You cannot feel your own existence or non-existence. You can feel the existence or non-existence of (such as) your hair, your hands, etc.

But you cannot feel the existence or non-existence of _you_.

— Me@2018-03-17 5:12 PM


Only OTHER people or beings can feel your existence or non-existence.

— Me@2018-04-30 11:29:08 AM



2018.04.30 Monday (c) All rights reserved by ACHK

Almost nothing new

The most valuable insights are both general and surprising. F = ma for example. But general and surprising is a hard combination to achieve. That territory tends to be picked clean, precisely because those insights are so valuable.

Because these start out so general, you only need a small delta of novelty to produce a useful insight.

A small delta of novelty is all you’ll be able to get most of the time. Which means if you take this route your ideas will seem a lot like ones that already exist. Sometimes you’ll find you’ve merely rediscovered an idea that did already exist. But don’t be discouraged. Remember the huge multiplier that kicks in when you do manage to think of something even a little new.

It’s not true that there’s nothing new under the sun. There are some domains where there’s almost nothing new. But there’s a big difference between nothing and almost nothing, when it’s multiplied by the area under the sun.

— General and Surprising

— Paul Graham



2018.04.22 Sunday ACHK

Eyes on me

dziungles 14 days ago

Hey, this is really cool to see natural eyesight topic on the hacker news.
I practice this for more than 10 years. Each day I work with computer for ~10 h., drive a car and do other things, and never wear glasses, even though the traditional ophtalmologic measures clearly indicate that I need strong glasses and I shouldn’t see even the biggest letter on the Snellen chart, but I see not only the biggest, but sometimes even the 20/20.

Doctors can’t explain this, and only congrats me on my achievement. Of course, the eyesight is not perfect. I see clearly in the daytime, but in the nighttime or low light conditions it becomes much harder to distinguish faces.

The best book I found so far is “Relearning to See” by Thomas R. Quackenbush. The originator of this theory was William Bates.

Actually, there is no clear unified theory on how to achieve this. Everyone interprets it differently and the results are inconsistent. There is also a lot of criticism from the medical establishment.

Natural eyesight improvement really works. And the unified theory, in a form of an app, or a good book, maybe including findings from neuroplasticity, would be a great gift for humanity.


bsder 14 days ago

Natural eyesight improvement really works. And the unified theory, in a form of an app, or a good book, maybe including findings from neuroplasticity, would be a great gift for humanity.

It SORT OF works in stable and predictable situations.

What seems to be happening is that your brain, in all of its neuroplastic glory, is learning to make better inferences from the broken information it receives.

The issue is that this works as long as the inferences are correct. That’s fine when you are reading a newspaper, using the computer, etc. as the situation is stable and predictable.

The problem is that when you are suddenly confronted by a situation where the inferences are NOT correct–such as a nighttime emergency situation while driving. Now you are relying on the “uninferenced” data coming in from your eyes and that data is subpar with all the resultant problems.

The best solution is both: fix the data coming in with corrective lenses for unpredictable situations, and train your brain to make better inferences so you can deal with predictable situations better.


dziungles 14 days ago

Before, I also had this theory in my mind for a year or so.
But for example, right now I’m in Thailand, traveling here for the first time. Everything is new, unfamiliar and unpredictable, daytime, nightime. I have no problems seeing things, everything is almost perfectly clear and sharp. I needed some time to adapt to a smaller screen of my laptop (I was using 24 inch before), but now I’m doing fine.

Actually, the more you look, the better you see. Like in Aaron Swartz blog post, if you want to retrain your weak legs, you need to walk more. Same with eyes.



2018.02.09 Friday ACHK

Zooming out

In this morning’s dream, I had seen an ultra zooming out of the universe, where in the end the universe became a particle of a super-universe.

Perhaps the afterlife (or near-death experience) is like this kind of bizarre feeling.

— Me@2011.08.17 

It is a fractal.

— Me@2011.08.22

Note: This kind of feeling is unhealthy, since it is induced by eating too little food.

— Me@2017.01.09

Several months ago, I had another this kind of super-feeling dream, in which I could get a time traveling feeling.

— Me@2011.08.17 

2017.01.14 Saturday (c) All rights reserved by ACHK

Euler Formula

Exponential, 2


general exponential increase ~ the effects are cumulative

natural exponential increase ~ every step has immediate and cumulative effects

— Me@2014-10-29 04:44:51 PM

exponent growth

e^x = \lim_{n \to \infty} \left(1 + \frac{x}{n}\right)^n

~ compound interest effects with infinitesimal time intervals

multiply -1

~ rotate to the opposite direction

(rotate the position vector of a number on the real number line to the opposite direction)

~ rotate 180 degrees

multiply i

~ rotate to the perpendicular direction

~ rotate 90 degrees

For example, the complex number (3, 0) times i equals (0, 3):

3 \times i = 3 i
(3, 0) (0, 1) = (0, 3)

multiplying i

~ change the direction to the one perpendicular to the current moving direction

(current moving direction ~ the direction of a number’s position vector)

exponential growth with an imaginary amount

e^{i \theta} = \lim_{n \to \infty} \left( 1 + \frac{i \theta}{n} \right)^n

~ change the direction to the one perpendicular to the current moving direction continuously

~ rotate \theta radians

— Me@2016-06-05 04:04:13 PM
2016.06.08 Wednesday (c) All rights reserved by ACHK


Publish! 7.2

We like to share because we like our information, ideas, and insights to have a future.

— Me@2011.08.07

2015.07.19 Sunday (c) All rights reserved by ACHK

Passion Test

The Top Idea in Your Mind, 6 | 事業愛情觀 6


To check whether a project is your true love, ask yourself:

Am I willing to spend INFINITE time on it?

— Me@2015-07-05 04:26:24 PM


Do you want it to be one of your lifelong projects?

Are you willing to follow it up for your whole life?

— Me@2015-07-12 11:00:11 AM



2015.07.12 Sunday (c) All rights reserved by ACHK

Wittgenstein’s ladder


   My propositions serve as elucidations in the following way: anyone who understands me eventually recognizes them as nonsensical, when he has used them — as steps — to climb beyond them. (He must, so to speak, throw away the ladder after he has climbed up it.)

   He must transcend these propositions, and then he will see the world aright.

— Tractatus Logico-Philosophicus

— Ludwig Wittgenstein

Before climbing a ladder, it is higher than you; after, you are higher than it.

— Me@2011.07.31

2015.04.02 Thursday (c) All rights reserved by ACHK

End-of-history illusion

The end-of-history illusion is a psychological illusion in which individuals believe that they have experienced significant personal growth and changes in tastes up to the present moment, but will not substantially grow or mature in the future. Despite recognizing that their perceptions have evolved, individuals predict that their perceptions will remain roughly the same in the future.

The illusion is based in the fact that at any given developmental stage, an individual can observe a relatively low level of maturity in previous stages. The phenomenon affects teenagers, middle-aged individuals, and seniors. In general, people tend to see significant changes in hindsight, but fail to predict that these changes will continue.

— Wikipedia on End-of-history illusion

2015.03.29 Sunday ACHK


1. The price paid for obtaining, or price received for providing, money or goods in a credit transaction, calculated as a fraction of the amount or value of what was borrowed

2. A great attention and concern from someone or something; intellectual curiosity

— Wiktionary

interest 2 ~ interest 1  

興趣 ~ 利息 

X is interesting

~ X can generate a lot of interest

~ X can generate a lot of automatic profits

~ X can generate a lot of next steps

— Me@2015-02-19 08:02:49 PM

2015.02.21 Saturday (c) All rights reserved by ACHK

Fasting creates new brain cells

So, what’s going on?

Well, when they examined the brains of the fasting mice.

They found something extraordinary. 

These green objects are newborn brain cells.   

These three here are brand new?

Sporadic bouts of hunger actually trigger new neurons to grow.

Why should a brain start to generate new nerve cells when you stop feeding it?

If you think about this in evolutionary terms, it makes sense.

If you’re hungry, you’d better increase your cognitive ability.   

That will give you a survival advantage, if you can remember where the location of the food is and so on.

It seems that fasting stresses your grey matter the way that exercise stresses your muscles.

So hunger really does make you sharper?

Yes. We think so.   

Mark’s research is starting to point towards a simple conclusion.

Alternate day fasting has better effects on the brain than does a lower-amount-of-daily-calorie restriction.

It’s true of mice, but he needs to do proper human trials to prove it’s true in us.   

I’ve come to the end of my search to find out how to eat, fast and live longer.

The official advice is, eat at least 2,000 calories a day, and if you really want to fast, even on an intermittent basis, see your doctor first, because there are people it could harm such as pregnant women or those who are already underweight.

— Eat, Fast and Live Longer

— BBC Horizon

— Me@2013-10-05 1:06 AM

2014.11.13 Thursday ACHK

End 2

Every good thing has an end.


~ 完

~ completed

completed ~ ended in a good way

— Me@2011.07.18

完成 ~ 完美 ~ 完結 ~ 圓滿 ~ 100%

— Me@2014.09.14

2014.09.14 Sunday (c) All rights reserved by ACHK

二百萬 2

這段改編自 2010 年 4 月 10 日的對話。






— Me@2014.08.24



2014.08.25 Monday (c) All rights reserved by ACHK