New study published in the journal The Journals of Gerontology: Series A (JGSA)sheds light on the troubling link between sleep disorders and cognitive health in older age. US scientists have presented estimates that chronic insomnia may be responsible for hundreds of thousands of new cases of dementia each year.
After analyzing data from nearly 6,000 Americans over 65, the researchers concluded that 12.5% of all cases of dementia in this age group were statistically associated with insomnia symptoms. Extrapolating that proportion to the entire US population, they came up with a staggering figure: about 449,000 potentially preventable diagnoses in 2022 alone. This is comparable to the population of a large metropolis.
In the study sample, 28.7% of participants reported sleep problems, and signs of probable dementia were identified in 6.6%. To strengthen their findings, the researchers integrated these data with the results of previous meta-analyses confirming that insomnia, on average, increases the risk of Alzheimer’s disease by 1.5 times.
What makes the work particularly significant is the fact that insomnia is a modifiable factor—unlike age or genetic predisposition, which cannot be changed, sleep quality can be improved through therapy. In terms of their contribution to the risk of dementia, sleep disturbances were comparable to other known factors: their influence (12.5%) is between the contribution of moderate hearing loss (16.9%) and mild (3.9%).
The study also revealed gender and age differences.
- Impact on women turned out to be somewhat more pronounced.
- Most casesassociated with insomnia, fell on the oldest group – people over 85 years old.
Scientists note that it is difficult to establish a clear cause-and-effect relationship. There is a vicious circle: on the one hand, chronic sleep deprivation can accelerate neurodegenerative processes, and on the other, early changes in the brain during onset dementia themselves often disrupt sleep architecture. This relationship complicates the search for exact mechanisms, but does not negate the practical value of the findings.
The authors insist that the findings provide a compelling argument for reconsidering approaches to the prevention of cognitive disorders. Assessment and correction of sleep disorders should become an integral part of geriatric practice and government programs to maintain brain health.
Regular screening and improving sleep quality may play a key role in reducing population risk of dementia,” the researchers summarize. The fight against insomnia goes beyond just making you feel better, and is becoming a potentially powerful tool for maintaining a clear mind as you age.
Image: freepic
date:2026-02-11 16:20:00