I'm of the opinion that people can adapt to less sleep. I spent quite a while sleeping exactly 6 hours per night, and then spent about 11 weeks alternating between 3 and 4.5 hours of sleep on weeknights and about 7.5 hours of sleep on weekends. This almost certainly wouldn't be a healthy thing to do for years on end, but for the 11 week period that I did this I felt pretty good (maybe 90-95% mental capacity) and was able to get a ton of stuff done with my ~20 hour days.
Again related to your post, this sparse sleep schedule was caused by college. I go to Caltech (for those who haven't heard of it, its probably pretty similar to MIT in terms of workload/intensity) and have a fairly typical sleep schedule among my peers. I'm pretty sure that every term (10 weeks) that I've been here I've had at least one 40+ hour period with 0 sleep, and had a term where I would sleep from about 7AM to 10AM every weekday (and then at least 10 hours/day on weekends). These longs hours are mostly caused by problem sets + studying, and things get a bit worse when you're actually too busy working to have time to go to class (which is a common occurrence).
As for why students do it, its to get everything done. Typical courseload is 5 courses/term, and starting in the middle of sophomore year most people are taking courses that would be intro graduate level courses at most institutions. 4 advanced math + 1 social studies/humanities course definitely keep you busy.
Also, among my group of peers, we typically define an "all-nighter" to be where you just complete the planned activities for the following day without any sleep at all. This generally involves staying awake from one morning (10AM) to dinner time on the next day (~5PM), making an all-nighter be ~30 hours. If an all-nighter were defined more leniently, we'd have a depressingly large number of all-nighters.
Note: Most of the above applies to my more difficult terms. I've also had terms where I slept 7+ hrs/night and maybe only worked until the sun rose about 2 or 3 times.
> I'm of the opinion that people can adapt to less sleep.
Your opinion has been proven wrong by every single scientific study on sleep. Humans do not effectively adapt to less sleep. Error rates go way up, productivity goes down disproportionally, focus goes down, etc.
Here is my problem with people like you pulling out their study reference lists against every anecdote: results drawn about people in aggregate do not necessarily mean much for this specific person in this specific situation.
"I am not the exception" is a good principle to live by, but it is also important to note that sometimes you are the exception, you are in exceptional circumstances, or you can become the exception (through exceptionally hard work for example, or exceptional stupidity. Being the exception is not always a good thing).
My experience is similar to lightcatcher's. When I was younger, before I was married and had kids, it was common for me to sleep 0-3 hours for a few days while I was working on something and then crash for a few days, sleeping 10-14hrs. Basically I slept when I felt tired, stayed up if I still felt alert. At the time I did not feel less productive and I did not feel like I was putting out lower quality work. Looking back objectively those were the most productive times of my life to date, and the quality of the work was on-par or better with anything else I have done. Temporary sleep deprivation under specific conditions was highly effective by all the objective measures I can think of.
Okay, but driverdan was saying "people can adapt to less sleep" not "I have adapted to less sleep." As if it's reasonable to expect that from people in general when, empirically, it's not.
Although I could have expressed myself better, you still quoted me out of context. I was particularly talking about people dealing with less sleep on a relatively small timescale (less than 3 months). I'm choosing the 3 month window because it replicates the length of a college term and greatly reduces the risk of burnout (which I don't think is as big of an issue in college as in industry, because typical college schedules give at least a few weeks off after each term).
Are there any studies that compare how much people can done in a few months on different sleep schedules? I'm imagining some sort of cognitive task (like reading books and passing a comprehension test, or working through all the proofs in a math book) where the goal of the participants in the experiment is to accomplish said task as many times as possible in a fixed time period. This would be very difficult to design because one needs to decide on cognitive difficulty for the task (if the task was very easy, then less sleep = more time would almost certainly help) and have roughly equivalent ability between the 2 groups. This study wouldn't capture dealing with context switches or retention of information; just how much can be done in a fixed time period.
As far as I know, such a study doesn't exist. Anecdotally, I've seen many people make the decision to trade sleep for more time even while working on cognitively difficult tasks. Personally, I feel like I accomplished more during my terms in school than I could have sleeping 7+ hours/night.
On the other hand, I acknowledge long term sleep deprivation is not good for long term health, and I've personally seen my ability to run with intensity suffer during periods of low sleep.
In summary, I don't doubt the long term effects of low sleep on health, I slightly doubt the negative long term effects of sleep on productivity (know people who have been doing uberman for years and swear by it), and I heavily doubt that people can't be more productive over <3 month window by sleeping less than the recommended 8 hours per day.
Those studies have been performed several times [1][2][3][4]; most of them indicate that moderate sleep deprivation (<6 hours) produces the same amount of cognitive impairment as being legally drunk. Many of them also show that people are unaware that their cognitive function is impaired when sleep-deprived: they may feel like they're productive, but their actual performance is riddled with errors that then need to be corrected.
> I'm of the opinion that people can adapt to less sleep.
Fortunately, we have facts about this, so we don't need opinions. Its not true, although it can appear true over short periods of time. More importantly, the amount of sleep a person needs can vary a lot between individuals - you might only need 6 hours/night, but that doesn't make it physically possible for everyone to survive like that.
Looking at the just the productivity aspect of sleeping less, I have yet to see a study that accounts for the extra waking time that people have when they sleep less.
How much you get done = rate of work * time working.
Many studies have shown that the rate at which people can "work" (which means something like respond to visual stimulus) decreases when people sleep less. I haven't seen a study that compares this decrease in rate to the increase in time available for work.
If I have to do a task 1000 times each day and each time takes me 2 seconds longer on 5 hours of sleep than it does on 8, it'll take me 2000s ~= 34 extra minutes to do the task 1000x when I'm on less sleep, but then I still have 2.5 hours left out of the 3 that I decided not to sleep. (Numbers from this inspired by [1])
I acknowledge the health issues of chronic sleep deprivation.
Again related to your post, this sparse sleep schedule was caused by college. I go to Caltech (for those who haven't heard of it, its probably pretty similar to MIT in terms of workload/intensity) and have a fairly typical sleep schedule among my peers. I'm pretty sure that every term (10 weeks) that I've been here I've had at least one 40+ hour period with 0 sleep, and had a term where I would sleep from about 7AM to 10AM every weekday (and then at least 10 hours/day on weekends). These longs hours are mostly caused by problem sets + studying, and things get a bit worse when you're actually too busy working to have time to go to class (which is a common occurrence).
As for why students do it, its to get everything done. Typical courseload is 5 courses/term, and starting in the middle of sophomore year most people are taking courses that would be intro graduate level courses at most institutions. 4 advanced math + 1 social studies/humanities course definitely keep you busy.
Also, among my group of peers, we typically define an "all-nighter" to be where you just complete the planned activities for the following day without any sleep at all. This generally involves staying awake from one morning (10AM) to dinner time on the next day (~5PM), making an all-nighter be ~30 hours. If an all-nighter were defined more leniently, we'd have a depressingly large number of all-nighters.
Note: Most of the above applies to my more difficult terms. I've also had terms where I slept 7+ hrs/night and maybe only worked until the sun rose about 2 or 3 times.