Those in the study were low-income adults in Chennai, India who sleep only 5.5 hours per night on average despite spending 8 hours in bed.
The key takeaway was:
> increased nighttime sleep had no detectable effects on cognition, productivity, decision-making, or well-being, and led to small decreases in labor supply.
I find the result surprising. When I get under 6 hours I see a clear drop off in performance.
The sentence before that is: "Contrary to expert predictions and a large body of sleep research".
Was this study better science that disproved the existing body? Or poorer science? Or is there something problematic about sleep in Chennai? Or special about the people in Chennai?
The full paper states:
> An enormous body of research, mostly conducted in sleep labs in rich countries, documents severe negative impacts of sleep deprivation on a range of outcomes from attention and memory to mood and health (Lim and Dinges, 2010; Banks and Dinges, 2007).
> While experimental evidence on the impact of increasing sleep in field settings is scarce, there is a widely-held belief among researchers and the public that reducing sleep deprivation would lead to improvements in economic outcomes
(Walker, 2017).
> To document these priors, we surveyed 119 experts from sleep science and economics who predicted sizable economic benefits, including a 7% increase in work output, of increasing sleep by half an hour per night from the low levels observed in our setting.
It could also be a function of their jobs, which weren't specified in the abstract.
While insufficient sleep might cause physical discomfort and contribute to long-term health problems, if their job weren't highly physically or mentally demanding, I suspect that most people could get through the day with negligible detriment to their short-term economic output after having a cup of coffee.
They employed 452 adults for a one-month data-entry job, which the authors say it's "a relatively cognitively-demanding task intended to be sensitive to sleep deprivation."
As a side note, the study also says that short afternoon naps increased productivity.
Because of a combination of health, family, and time zone issues, I sleep approximately 5 hours a night (6 or 7 on weekends, if I'm lucky). I also have a complex work environment where the ability to think quickly, have excellent recall, and make quick decisions is paramount (I manage two dev teams working on two very different code bases, facing very different challenges). The people I work with are often "the smartest person in the room" and notice slips and mistakes.
Anyway, I get by through a combination of sneaking naps, trying not to sabotage myself by eating/living poorly, and catching up when I can.
I suspect the people in this study do the same. They probably doze when on public transportation, or trying to get the kids to sleep, you'll lay down with them and sleep a little. These stolen moments add up. Also, learning to recognize the signs of mental fatigue - if you can't get rest, then, you have to slow down and double check everything, not get irritable, and defer major decisions.
I'm...extremely skeptical a generic "data entry job" is "high cognitive demand".
I can write new applications (atrociously) on basically no sleep, so I'm pretty skeptical "sit at this desk and enter these things" swings one way or the other (or even has much of an ability to quality check - at least the compiler will yell at me when I'm egregiously wrong).
I'd be far more interested if these people could be trusted to run heavy machinery on that schedule, or engage in a creative or hands on task like carpentry or welding. I suspect the results would be quite different.
I'm...extremely skeptical a generic "data entry job" is "high cognitive demand".
Same here. While writing the GP comment, I considered using that exact example as something that I wouldn't expect to be heavily impacted by moderate sleep deprivation.
I don't know how well it compares to a spanish siesta but the abstract ends with "In contrast, short afternoon naps at the workplace improved an overall index of outcomes by 0.12 standard deviations, with significant increases in productivity, psychological well-being, and cognition, but a decrease in work time."
The average teacher’s job is reasonably mentally demanding but despite waking and starting work at unnaturally early hours (in the US and China) people do acceptably with coffee. The students do worse because the schedule is even more divergent from their natural sleep schedule and they’re less likely to have coffee or other stimulants.
Given the attendance rate at private schools (low) and their divergence from the normal public school schedule (low) this doesn’t seem accurate. People may complain but they don’t do anything.
In my country it's the same, I think it is done that way because most people jobs start at 8 or 9, there's no school bus system, only private transport for kids going to school, so this schedule gives a chance for parents to drop off their kids at school and make it to work afterwards.
Personally I hated it at the time, because getting up early is not my thing, but now I appreciate the time I got to talk with my parents on my way to school thanks to that schedule arrangement.
Also to offset this early getting up, we jus went to bed earlier, like at 9pm or 10pm max, so not sure it really made a difference on anything.
> The educational effects of school start times
Delaying secondary school start times can be a cost-effective policy to improve students’ grades and test scores
> The combination of changing sleep patterns in adolescence and early school start times leaves secondary school classrooms filled with sleep-deprived students. Evidence is growing that having adolescents start school later in the morning improves grades and emotional well-being, and even reduces car accidents. Opponents cite costly adjustments to bussing schedules and decreased time after school for jobs, sports, or other activities as reasons to retain the status quo. While changing school start times is not a costless policy, it is one of the easiest to implement and least expensive ways of improving academic achievement
I grew up in rural Canada, and we had busses. Some kids came in from 60+ miles away. I recall quite a bit about school, and yet no one really complained about getting up at 5 to 6am.
Of course, most kids lived on farms, some even had chores before going to school, and early to bed, early to rise was normal.
We had a few antenna TV stations, no cable, VCRs weren't around for the average family, and of course no Internet.
We also didn't have city street lights / ambient light, street noise, the sound of neighbours.
People have gotten up early to do farm work for aeons, and go to sleep early too. In fact, to be more precise, staying up past 8 or 9pm is an urban / modern aberration.
Point is, staying up late is the problem. Nothing more.
Now of course, society has changed, so maybe change is needed. However, there is also a lot of counter literature on even TV as a sleep depriver. And now we have phone in bed, with a glowing screen, keeping a mind active.
My point? OK, change the time. However, will kids just stay up even later?
Or, as they do now, will they think "I should go to sleep now, or I will be tired tomorrow, but just one more text..."?
Staying up late is much easier then getting up early. Anyone who gets up early and then has to be anywhere can speak to the general paralysis that involves, since the entire activity has to be planned around a very sharp time-based shutdown.
Stealing hours later is a lot easier, because any amount of sleep will still break up the day compared to none.
The other reason of course is that the real trick is just staying up longer then your parents: that's the only truly unsupervised freedom you have as a kid.
Eating too much, borrowing more money than you should, eating junk food, staying up too late, being addicted to your phone, texting whilst driving, perhaps these are all the same problem?
And like any animal, we need to be trained to control ourselves, when young, for our own good?
Most developed countries are far enough from the equator that the amount of daylight is very different during different parts of the year. Perhaps it would make sense to base the schedule around sunrise and sunset rather than around arbitrary numbers?
I mean with most clocks also being internet connected computers it wouldnt be too hard to make a system where you measure time in hours after average sunrise in a tike zone.
That is where I live right now it's sunrise +3.
I'll reschedule the daily 'standup' to SR+3.5, the banks open at SR+3 and close at SR+11.
One major consequence I can see is that now we have north south timezones on top of east west.
This would break in the extreme north or south where there are days without a sunrise.
That's what time zones are. You're just proposing more granular time zones. And none of them can fix the problem that in a lot of places the days are just short in the winter.
Timezones don't account for seasonal changes in sunrise times, and DST is a poor hack that tries and fails. Using local solar time would be an improvement in that regard. On short days you just do less.
Timezones are a reasonable compromise between the desire for people to be up during the day, on one hand, and the need for a modern economy to be able to coordinate people over long distances, on the other. Turning up the dial all the way to the left here is going to cause a lot of problems.
As far as human biology is concerned, the entire concept of agriculture is a modern perversion. You can't use it to argue a particular behavior is the natural state.
And yet people get up before dawn to go fishing and hunting.
At no point did I cite biology. Instead, I validated that different wake-up times have existed in the past, and in fact still do.
When does the garbage man, the builder, the mechanic get up? The blue collar man? It isn't 8am, that's for sure. People I know in these professions of start work at 7am. Or earlier. I see them get to sleep by 9pm.
Get to sleep sooner, discipline yourself, as with anything else, it's just that easy.
In the USA, school schedules are at least partially dictated by after-school sports. Classes need to end early enough that teams can practice in daylight.
My high school started at 08:10 (I think) and elementary school at 08:15 and those were the earliest starters in the neighbourhood. University luckily started around 9.
In my country poor people are: doctors and nurses who work at state hospitals(most of them), teachers at state schools, university professors(both state and private ones), engineers who work at such government facilities as nuclear plants and the like, scientists in general and also some government officials.
All them make roughly 10-20% percent of what moderately skillful software engineer could make, in the same city and country.
Just for the reference.
They probably make more than minimum wage workers at (fast food|restaurants|cleaning|etc) ? So even if they're relatively poor compared to skilled software engineers ( which is usually even more skewed because skilled ones often work for rich foreign companies that can afford a much better salary and still come out cheaper than engineers in their original country), they're still better off than minimum wage, who are the real working poor ( note that in some countries and cities minimum wage can be sufficient and wouldn't put you in the poor category)
Well not really. Actually minimum wage in Ukraine (where I live) is rather low, so businesses generally pay higher.
Fast food workers are not on minimum wage.
In terms of salary a school teacher would make less or the same as McDonalds worker.
For example, McDonalds Ukraine pays an entry level worker -14 000 UAH ($500) monthly for 40 hours per week.
School teacher makes minimum 5000 UAH ($180), +bonus(10-60%). Teacher who was awarded a "highest category" certification (that would be a very experienced one) and who will get all the possible bonuses and raises will make around 14 000 UAH, roughly.
Workers, cleaning personnel would make in the same ballpark 9000 - 14000 UAH ($300-500) at least in Kyiv. Selling phones in the store, work at supermarket also has a similar remuneration.
Average doctor salary (not nurse) is 9000 UAH, at least officially.
The reason is - most those highly skilled and highly educated workers that I've mentioned are paid by the government which does not have funds and desire honestly to treat these people well. They are remnants of decaying public infrastructure - Ukraine has de jure free universal health care and a very big amount of government-funded seats at state universities.
Still it is better to work at school than at the factory probably.
You just have a stereotype of how certain things work, everything is not like US/Western Europe structurally. Higher education is not a ticket to a better life everywhere.
Ah, sorry, didn't know things are that bad in Ukraine. I'm from Bulgaria so i can assure you my stereotypes are mixed and i don't think everything is like in the US or Western Europe.
How's the new president doing? At first it seemed like a joke, but the little concrete things i've read about him post-election seemed OK.
Of course, I think you can really get the idea what is going on in Ukraine due to kind of similar circumstances. Sorry for being a bit too blunt.
New president I think is a bit better than the previous three but the whole situation kind of shows two things:
1) There is not much you can do in the country where oligarchs control everything.
2) There is still not much ideas for the future except some sort of a neoliberal 'reaganomics', further privatization and generally disengagement of the state from any meaningful public good iniatives.
To put it into context, no, these people make around the same as factory worker. Work conditions would be much nicer, still.
Schoolteachers are considered 'poor' by other Ukrainians (who are not too well-off themselves) compared to other occupations without taking into account SW jobs and anything like that.
Ukraine. I think it would similar in other post-socialist states where transition to market economy was not a big success. I would put Moldova, Armenia in the same ballpark, maybe certain poorer Central Asia states like Uzbekistan but I'm not 100% sure.
They employed 452 adults for a one-month data-entry job, which the authors say it's "a relatively cognitively-demanding task intended to be sensitive to sleep deprivation."
> Please stop repeating this anti-psychiatric talking point.
That's rich. Here's a prominent psychiatrist's view (who btw, supports and does prescribe amphetamine adhd medication):
"There's a lot of confusion around the difference between amphetamine and methamphetamine. On the one hand you have anti-psychiatry activists who will say that using Adderall for ADHD is exactly like giving kids crystal meth; on the other you'll have people who say that obviously normal amphetamine is okay, but meth-amphetamine is a demonic substance that will hijack your brain and destroy your life. The truth is more complicated.
Methamphetamine crosses the blood-brain barrier more effectively than unsubstituted amphetamine, but I'm not sure how much that matters since people take different doses of both, and a high dose of unsubstituted will end up with more reaching the brain than a low dose of meth. It seems to inhibit the dopamine transporter more effectively, which might matter, but I'm not enough of a pharmacologist to know how much. Meth takes effect more quickly, which seems to increase addictiveness in a sort of behaviorist sense where the sooner a stimulus gets reinforced, the more rewarding it will feel.
I think there's been a little bit more research since then, but the general takeaway - that the science doesn't support the vast gulf between these two drugs in the popular imagination - still seems true."[0]
Many countries in the WW2 era sold amphetamine based drugs as antidepressants, for "creating the right attitude", making your wife focus on housework, etc. (and other rather disturbing things). Essentially, drugging workers doing low-skill tasks to make them more cooperative or productive or something.
I wonder how much research was done at the time and has been done in retrospect.
And still in 2021 most people are entirely unaware that their affectionately named ”morning joe” contains other mind-altering chemicals in addition to caffeine: Harmala alkaloids that slow down the normal breakdown of neurotransmitters and slowly build up in brain fatty tissues, increasing tolerance and lengthening withdrawal symptoms to many months.
I don't think it's necessarily incompatible even if it seems contradictory unless there's research that quantifies the harm as a function of sleep deficit. Could easily be some range of sleep deprivation in which you're just bad at things, you move slow, and you're unmotivated. Intuitively we'd think that it's directly proportional to the amount of sleep deprivation, but I don't know if I've seen research that makes that claim. It would be interesting to see more papers that lead to a model of the benefit of sleep as a function of the amount of time slept.
Good grief. It almost makes me question what information is missing from the abstract since I don't know how one can consistently run on fumes without it affecting cognition, productivity or decision making.
Throwaway as I don't want to admit that I feel permanently cognitively impaired.
Anecdotal, but I spent years not sleeping through university and sleeping in airports or on the train. Studied engineering and did a lot of hackathons and events and stuff. I figured out then that I didn't need full cognition or excellent decision making. I needed more hours cranking out work. I spent years sleeping just a few hours and often not sleeping on Saturday at all.
I do a lot less of that now as work never has 2AM deadlines but it is as though I am permanently in that 80% functionality state. I never felt that I got out of that state. I have never regained my ability to be detail oriented. I am still reliant on the crutches of spell check and Grammarly and my IDE to make sure I don't do something stupid. I use task lists for every little thing in my day.
So it is not that it does not impact cognition (at least in my case), it is that you get used to that impaired state and can't find a way back.
Only a year and a half removed from that, so maybe it takes more time, but I still feel heavily optimized for output over quality, even though that is no longer needed.
My baseline cognition was already impacted. More sleep just did not repair it.
From my own experience: go get therapy, meditation classes and Ritalin! It wasn’t until I turned 26 and got access to all three that I could finally _learn_ what concentration really was. I went through Highschool without having to study a single day, getting very good grades nevertheless - while being on very little sleep with a total lack of a regular rhythm. College didn’t go so well, but other interests and pursuits were fulfilling. Meanwhile, the rise of social media trained my attention span to be shorter and shorter and shorter - until I had finally realized I couldn’t reed a single page of a book without drifting away.
The above mentioned three-part intervention worked because A) in therapy, I could get i) help how to navigate the day-to-day problems and ii) help understanding why and how I got to that point, e.g. learned behavior, but also genetic predisposition, B) thanks to the medication, I could experience a state of high focus I hadn’t had in years - maybe ever - and enjoy a kind of focused flow, where I was completely in charge of what I do (compared to a state of flow where you just follow external and internal impulses ) and C), meditation (especially in the time I took ritalin) helped me learn how to focus on something, let go of that focus, and re-focus again (I used headspace for that).
I cannot tell you if a change in my sleeping habits was the result of all that, if it has been a coincidence or if it preceded any improvements - but it certainly didn’t hurt the process.
Today, I don’t need therapy or medication anymore, can focus good enough on my work and in the stories my significant other tells me. I don’t get nervous anymore anytime I have to wait in a line, I do fewer mistakes, I can read a book and feel less bored, more happy. It’s something I had to learn, but I needed some help with that. It’s worth a try!
Today, I also realize a significant decrease in performance and happiness if I get a single night of bad sleep. Before I knew how my days could really feel, I didn’t care about that - but I’m sure I had been impacted badly, nevertheless.
OP stated he’s 18 months out of insomnia, but the adhd-like symptoms still prevail up to a point where he is suffering so much that he hides his (or her) identity when speaking about it. He describes himself as “permanently cognitively impaired”.
I used to believe in all that fear mongering about stimulants for years, but as long as you stick to your doctor’s prescription, start with low doses and pay as much attention as possible to yourself and how you react - through therapy supported by mindfulness - the risks are very low compared to the risks of having a “cognitively impaired” life. That state, however you label it, does not only hurt your performance at work, it hurts your relationships (healthy relationships are correlated with mental health and longevity), it increases your risk of car accidents (some of them kill) and it exposes you to financial risks. It’s not a good place to be, and I support everyone in that place with a simple message: go to a doctor, get therapy, get medication, be mindful about it.
If you would check again: it’s the third advice, not the first. You cannot get it without consulting a psychiatric MD, and at least in Germany, you have to commit to long term behavioral therapy as well. To make it as clear as possible: I would not recommend popping pills as a solution to the problems faced by the parent comment, but as a viable part of an integrated solution. Fear mongering doesn’t help anyone.
>From my own experience: go get therapy, meditation classes and Ritalin!
This is your first advice. Anyway, no need to get pedantic. Fact is you're carelessly suggesting the use of some pretty heavy and specific medicine, to someone you don't know, based on a few words of text he wrote on an anonymous internet forum.
What degree of heaviness is okay for drugs to be an okay recommendation on a quite specific problem? Did you ever recommend someone to get an Aspirin due to headache? Hope you didn’t - Aspirin is so dangerous, there’s no way we would allow it on the market according to today’s regulation.
That said, the point here cannot be the danger of medication, but the public perception. Ritalin in adults is very safe if prescribed and monitored by a doctor and supervised by therapy. Taking into account the rate of comorbidities of untreated adhd symptoms (btw, as far as science goes, it’s a spectrum, not a classification, so you’re higher high or low in such treats), such as depression, implying Ritalin were dangerous even if taken as a part of a broader treatment regimen, is much more dangerous.
Since I had a child, I started questioning whether cognitive decay in aging people was really caused by aging or a change in sleep patterns. Now my kid makes his nights mostly without problems, but the ~2 years of insufficient sleep feels like it had a toll.
My sleep was somewhat destroyed from having kids. Not that I was extremely underslept, but my brain somehow stopped sleeping deeply it felt like. I awoke from every minute sound the kids made.
Today theyr'e 7 and 9 and I still wake from silly sounds.. Some sounds the kids make is like driving a knife through my ears. It is getting better but still...
The upside from this is now I don't need anywhwre near 8 hours of sleep anymore! 7 hours is almost too much, 6 works perfectly most of the time. 5 hours though is when I get into zombie-mode during daytime.
Same. I mean there are probably multiple factors in play but I can't imagine the interrupted sleep, plus the baseload stress and anxiety, are good for long term mental health. Hoping its counteracted by long term benefits of rewarding family relationships.
From your description, it's possible that you have undiagnosed ADHD, though probably not caused by lack of sleep. It's always worth talking to a doctor about these things — there might be a way to get your focus back.
There's little evidence that this is sleep related. There are a lot of people who aren't detail oriented and rely on spell check, for a very wide variety of reasons.
If you feel this has impacted your life to the point where you need to hide your identity, maybe you should try therapy or a medical examination. Or just get more sleep
Well, humans are also extremely error prone. Spell check, IDE helpers, delinters, automated testing, etc, all help check that things are correct automatically, which saves huge amounts of pain.
I personally would always put more faith in someone who carefully checks their work than someone who thinks they don't need to. The second person is making mistakes and just doesn't realize it.
I had a similar experience from severe burnout - I was overly ambitios and worked for 12 hours + poor sleep.
Its like you feel dumb and that you will never regain the clarity of mind.
It took me a couple of years to get back to normal (around four I think). That included a year of therapy and a half of year of just doing the stuff that I like with no job commitment.
Some downtime is needed.
Even when I'm "full focused" I still use stuff to automatic check my work (same as you). However I'm bit worried on how you seem functioning on "automatic"... I really do recommend going to a doctor.
If I have some auto checker i start to concentrate my errors into things the checker will find. Make errors that the compiler will find, so that once it compiles it should pass tests at once.
But why are you doing this to yourself? The impact of not getting minimum sleep will have all sorts of bad effects on your body, not just cognition. Try to find a balance and what you consider as permanent cognitive impairment may revert, but even if it doesn’t you don’t want to make it worse
There is also a dynamic systems side to sleep rhythms. Quite likely there are stimuli you can randomly experience that shift your sleep cycle into a chaotic regime and then you need a good knock to the light and activity levels to reset to stability.
Possible "misaligned" is a better descriptor? I don't know about most people, but according to a sleep app I've been using for a while now, my REM cycles seem to be around 1.5-2 hours. Waking up at between cycles works well, adding a half hour does not.
+1. Though remember we're talking averages, and different people have different sleep needs. One would think some of them saw enough increase in sleep quality to show up in the stats.
> ... only 5.5 hours per night ...
> ... increased sleep duration by 27 minutes per night ...
I'm not surprised. On average, they were still under 6 hours, if barely. And if the sleep problems are interrupt-driven, this study does not appear to account for sleep quality.
Ok, then we could assume the hypothesis: Either you sleep 8 hours and are productive or you go down to 5.5 because 6 wont increase your efficiency levels either.
Its possible that the home environment is so bad, that any increase in sleep yields no improvement. By contrast the workplace might be comparatively better controlled.
Getting rid of fossil-fueled cooking, power generation and transport solves some of these issues.
A lot of homes in crowded cities like Chennai and Bangalore are tightly packed, congested and poorly ventilated. Air (dust) and noise (human activity) pollution is very high. Within the same congested dwelling, there maybe people who have to get up very early and go to work or come home late and sleep late which disrupts everyone's sleep. So it is highly likely that there is only 4-5 hour window at night when things are quiet enough to get good sleep.
I'm not in India, and it's pretty common for me and my wife to spend time in bed that we're not sleeping, and I'm not talking about sex. I'm talking reading, browsing our phones, etc. We don't have a TV in there, but it's not a far stretch as I did when I was a kid, and so did my parents.
For a healthy person in a good bed without interruptions, 8 hours. But if you have trouble falling back to sleep after being woken up, you can lose a fair amount in a noisy environment. If your bed is bad, you may wake up or not fall into a deep sleep. And there are medical conditions that can make you be unconscious but not actually sleeping. Plus, high stress levels interferes with sleep.
I read it as then saying they just got them to spend even more time in bed, despite the problem being they already have a lot of non-sleep time in bed. So it just reduced their time available to do other stuff. Am I misunderstanding?
I read the abstract like the managed through information to reduce the non sleeping time in bed. They shd have used a fitness tracker to confirm, relying on the answers of people who might think their income depends on giving the 'right' answers is dangerous.
oh yes, thanks. I didnt parse the second half of the sentence. This totally doesnt make sense. I mean people seem to have a lot of interrupted sleep, wouldnt reduce the interruption increase sleep quality (and time)? (But probably due to small infants, so might be difficult to change that)
Is it so surprising? The key takeaway could be rephrased “Healthy humans living under conditions similar to our evolutionary past naturally sleep an optimal amount of time at night.”
> When I get under 6 hours I see a clear drop off in performance.
Or is it “When I temporarily find myself in an environment with stress-levels similar to those of the people in the study I a) start to perform like them on modern day tasks and b) start to sleep like them.”?
The better takeaway is that napping is awesome! Moving work time into nap time resulted in a net productivity increase! That's amazing.
If you consider taking 30 minutes of a 6 hour shift to nap, that means they have to be 10% more productive for the 5.5 hours after the nap. I'd suspect hawthorne here, even though it didn't show up in the night treatment group, but it would be interesting to see if this productivity increase is sustained in the long run.
>In contrast, short afternoon naps at the workplace improved an overall index of outcomes by 0.12 standard deviations, with significant increases in productivity, psychological well-being, and cognition, but a decrease in work time.
Time spent napping >> time in bed. They're sufficiently exhausted by mid-day to get higher quality rest than they would by spending the same time in bed.
If you're tired, you're better off getting up at your normal wake time, then taking a nap later.
I would look at the eight hours in bed as a possible explanation. While they weren't technically asleep, they likely still saw resting benefits just from laying down for a prolonged period of time.
> When I get under 6 hours I see a clear drop off in performance.
Same. I have a hard line at 6 hours. Over 6 and I'm good, less than 6 and I'm dead all day. I don't use an alarm and wake up naturally after around 7 hours of sleep, but that last hour I'm normally aware of the lighter sleep stage I'm in.
That wasn't the entire result. What I took away was this:
>In contrast, short afternoon naps at the workplace improved an overall index of outcomes by 0.12 standard deviations, with significant increases in productivity, psychological well-being, and cognition, but a decrease in work time.
They increased the participants sleep from 5.5 hours to 6 hours per night and expected improvements in cognition. This is not how sleep works, AIUI. This is like expecting to get rich after overdrawing your bank account by $140 per week instead of $175 per week.
Having stayed in an Indian city. Traffic noise and pollution is horrendous. I can see how these two factors would mess with sleep quality and duration.
The key takeaway was:
I find the result surprising. When I get under 6 hours I see a clear drop off in performance.