Too Little Sleep: The New Performance Killer
By Margaret Heffernan | February 10, 2011
As we all work longer and longer hours, take less vacation and work through the weekend, we may assume we’re being heroic, or virtuous.
The truth is we’re not; new research shows we’re stupid.
Quite literally.
Missing just one night’s sleep has a noticeable impact on the brain’s ability to function as Dardo Tomasi and his colleagues at the Brookhaven National Laboratory discovered when they took 14 healthy, non-smoking right-handed men and made half of them stay awake through the night. In the morning, both rested and groggy subjects were put through a serious of tests that involved tracking ten balls on a screen. As they completed the tests, an MRI scanner took pictures of their brains, to see how the rested brain differed from the one that was deprived of sleep. They found that the sleepier the subjects, the lower their accuracy in the tests.
The Smartest Thinking is First to Go
Most telling of all, the higher order brain activity - in the parietal and occipital lobes - was the first thing to go. But while the parietal and occipital lobes were less active, the thalamus was very busy. Scientists hypothesize that it works extra hard to stay alert. So all the energy you want to concentrate on solving a hard problem just goes on staying awake.
What these and other studies indicate is that, yes, we can stay awake for long periods of time with little sleep - but what we lose, progressively, is the ability to think. “A tired worker tends to perform like an unskilled worker.” Or you could say: a smart worker starts to work like a mindless one. I was reminded of this when interviewing former Countrywide mortgage dealers, so many of whom talked about their sweatshop hours.
An adult should get 6-8 hours of sleep a night. Less than that, and sleep deprivation starts to starve the brain. There is why we crave comfort food - donuts, candy - when we’re tired: our brains want sugar. After 24 hours of sleep deprivation, there is an overall reduction of 6 percent in glucose reaching the brain. But the loss isn’t shared equally; the parietal lobe and the prefrontal cortex lose 12 to 14 percent of their glucose. And those are the areas we need most for thinking: for distinguishing between ideas, for social control and to be able to tell the difference between good and bad.
MY THOUGHTS
old habits die hard. that includes sleeping habits. back in college, i would go for days without shuteye. i couldn't shake off the habit. i've convinced myself that my best "thinking times" are at midnight until the wee hours of the morning. probably true when i was a lot younger. doesn't hold water now. the past couple of weeks i would work until 3 or 4am. the next day, i have to redo a lot of things because a lot of what i've done weren't sensible enough. i was working hard. but i wasn't working smart.
By Margaret Heffernan | February 10, 2011
As we all work longer and longer hours, take less vacation and work through the weekend, we may assume we’re being heroic, or virtuous.
The truth is we’re not; new research shows we’re stupid.
Quite literally.
Missing just one night’s sleep has a noticeable impact on the brain’s ability to function as Dardo Tomasi and his colleagues at the Brookhaven National Laboratory discovered when they took 14 healthy, non-smoking right-handed men and made half of them stay awake through the night. In the morning, both rested and groggy subjects were put through a serious of tests that involved tracking ten balls on a screen. As they completed the tests, an MRI scanner took pictures of their brains, to see how the rested brain differed from the one that was deprived of sleep. They found that the sleepier the subjects, the lower their accuracy in the tests.
The Smartest Thinking is First to Go
Most telling of all, the higher order brain activity - in the parietal and occipital lobes - was the first thing to go. But while the parietal and occipital lobes were less active, the thalamus was very busy. Scientists hypothesize that it works extra hard to stay alert. So all the energy you want to concentrate on solving a hard problem just goes on staying awake.
What these and other studies indicate is that, yes, we can stay awake for long periods of time with little sleep - but what we lose, progressively, is the ability to think. “A tired worker tends to perform like an unskilled worker.” Or you could say: a smart worker starts to work like a mindless one. I was reminded of this when interviewing former Countrywide mortgage dealers, so many of whom talked about their sweatshop hours.
An adult should get 6-8 hours of sleep a night. Less than that, and sleep deprivation starts to starve the brain. There is why we crave comfort food - donuts, candy - when we’re tired: our brains want sugar. After 24 hours of sleep deprivation, there is an overall reduction of 6 percent in glucose reaching the brain. But the loss isn’t shared equally; the parietal lobe and the prefrontal cortex lose 12 to 14 percent of their glucose. And those are the areas we need most for thinking: for distinguishing between ideas, for social control and to be able to tell the difference between good and bad.
MY THOUGHTS
old habits die hard. that includes sleeping habits. back in college, i would go for days without shuteye. i couldn't shake off the habit. i've convinced myself that my best "thinking times" are at midnight until the wee hours of the morning. probably true when i was a lot younger. doesn't hold water now. the past couple of weeks i would work until 3 or 4am. the next day, i have to redo a lot of things because a lot of what i've done weren't sensible enough. i was working hard. but i wasn't working smart.
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