Zoning out bad sleep? A new study says this could be a good thing
4 days agoLast Updated: November 1, 2025
3 8 minutes read
Zoning out bad sleep? A new study says this could be a good thing
By Ava Levinson | Published: 2025-10-30 15:21:00 | Source: Inc.com
It turns out that when your sleep declines, your brain is working overtime. A New MIT study It appears that when sleep deprived, the brain periodically secretes cerebrospinal fluid (CSF), the same process that normally occurs during deep sleep. Researchers have found that it is these fluid waves that cause poor attention
Normally, the flow of cerebrospinal fluid during sleep helps eliminate Accumulated waste from the day. The scientists wanted to know how sleep deprivation might be affected, so they recruited 26 volunteers to perform tasks during the morning after a good night’s sleep and again when sleep deprived.
The tasks tested reaction times while participants gazed at an image of a cross on a screen. The first task asked them to press a button every time they noticed the intersection turning into a square. The second requires responding to a beep rather than a visual shift
During the task, participants wore EEG caps to record brain waves while inside an fMRI scanner. This setup allowed the scientists to measure blood oxygenation in the brain, the flow of cerebrospinal fluid to and from the brain, the participant’s heart rate, breathing rate, and pupil diameter.
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Unsurprisingly, sleep-deprived volunteers performed worse. Their response times were slower, and sometimes they registered no change at all
But the researchers noticed that cerebrospinal fluid flows out of the brain at the same time that attention is lost. When attention recovers, the fluid flows again. They hypothesized that this was a sign that the brain was working to catch up with a cleansing process that should have happened overnight.
“One way to think about these events is that your brain is so desperate for sleep, it is doing its best to enter a sleep-like state to restore some cognitive function,” says Zhenong Yang, a postdoctoral researcher at MIT and lead author on the article. press release. “Your brain’s fluid system tries to restore function by causing the brain to cycle through states of high attention and high flow.”
It is not only the brain that suffers from these psychological changes. The scientists found that the pupils constricted about 12 seconds before the influx of cerebrospinal fluid and dilated again afterward. Respiratory rate and heart rate decreased during periods of loss of attention
So, there appears to be a strong connection between our ability to stay alert and the brain’s recovery process. Without enough sleep, you’ll likely be slower at completing daily tasks, but it’s comforting to know that your brain is really working to keep up with you at speed.
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