Researchers analyzed health records from nearly 2 million patients and discovered higher dementia risk for patients with insomnia, depression, and both depression and insomnia.
RT’s Three Key Takeaways:
- Compounding Risk – Adults over 50 with both depression and insomnia face a 91% higher risk of developing Alzheimer’s disease and related dementias compared with those without these conditions.
- Depression as Key Driver – Depression alone increases dementia risk by 70%, far more than insomnia’s 11% increase, but the combination produces the greatest danger.
- Prevention Opportunity – Researchers emphasize that early diagnosis and treatment of depression and sleep problems could play a meaningful role in reducing dementia risk in aging adults.
A study conducted by researchers at Saint Louis University found that people over 50 who suffer from both depression and insomnia are significantly more likely to develop Alzheimer’s disease and related dementias.
Researchers analyzed health records from nearly 2 million patients and discovered that:
- Individuals with both depression and insomnia had a 91% higher risk of developing dementia.
- Those with depression alone had a 70% increased risk.
- People with insomnia alone had an 11% increased risk.
- The risk was similar across racial groups.
The study, recently published in Aging & Mental Health, highlights that depression is the strongest contributor to dementia risk, but when combined with insomnia, the danger is even greater. These findings suggest that early treatment of sleep problems and depression could help reduce the chances of developing dementia later in life.
“Mental health care is a critical part of dementia prevention, especially for older adults,” said SangNam Ahn, Ph.D., associate professor of health management and policy at SLU and lead author of the study. “Too many individuals with depression and insomnia remain undiagnosed or untreated. Expanding access to therapy and mental health services could make a meaningful difference in reducing the risk of Alzheimer’s and related dementias.”
Ahn further stated that this research contributes to the growing evidence that mental health and sleep quality are key factors in brain health, and researchers urge health care providers and policymakers to take action to support vulnerable populations.
