June 20, 2023 – As we age, the human brain step by step declines in performance. But a brand new study suggests that individuals who often take short naps through the day can slow this aging process by two to 6 years.
The researchers wrote that “this difference is roughly equivalent to the difference in brain volume between people with normal cognitive function and mild cognitive impairment.”
Published on Monday within the magazine Healthy sleepThe study examined data from 378,932 people aged 40 to 69. The average age was 57. The people, all from the UK, had previously submitted their health and genetic information to a database called UK Biobank.
Starting at age 35, the brain begins to shrink at a rate of 0.2% per 12 months, and the speed increases to 0.5% per 12 months by age 60, the authors noted. They decided to review the results of naps on brain volume since the rate of brain shrinkage has been linked to conditions akin to Alzheimer's disease, and brain volume has been linked to sleep disorders akin to insomnia.
“Our findings suggest that for some people, short daytime naps may be a piece of the puzzle that could help maintain brain health in old age,” said genetic epidemiology researcher Victoria Garfield, PhD, at University College London in a opinion.
The researchers used a posh method based on an individual's genetic profile to discover individuals who often took daytime naps. As a part of their participation in providing data to the UK Biobank, the people collaborating within the study had undergone cognitive tests to evaluate their visual memory and response time. One group of the people collaborating within the study also had brain images from MRI scans stored within the UK Biobank, which the researchers used to analyse the scale of the people's brains.
The authors identified that previous studies have shown that daytime naps affect brain health in older people, akin to improved performance on cognitive tasks. Some studies have shown that the advantages of naps last for several hours and even a complete day. However, this latest study failed to seek out a link between naps and folks's performance on tests of visual memory and response time. The researchers wrote that they were surprised by this result and suspected that the tests the study participants took could have been flawed.
“I hope that studies like this one, which demonstrate the health benefits of short naps, can help reduce the stigma that still exists around daytime naps,” Garfield said.