Summary:
An international umbrella review led by the European Academy of Neurology and MedUni Vienna reveals that chronic insomnia is associated with a 26% higher risk of stroke and a 28% increase in hospitalizations. The analysis also identified significant links between persistent sleep disruption and heightened risks for Alzheimer’s disease, depression, and suicidal behavior.
Key Facts:
- Elevated Stroke Risk: A meta-analysis pooling data across more than 1.3 million participants found that individuals suffering from insomnia had a 26% higher risk of experiencing a stroke.
- Increased Hospitalizations: Individuals with insomnia were 28% more likely to be admitted to the hospital compared to those with healthy sleep patterns.
- Brain Health Warning Sign: While direct causality remains unproven, the evidence links insomnia to multiple adverse neuropsychiatric outcomes, including dementia (particularly Alzheimer’s disease), clinical depression, and suicidal behavior.
Source: Medical University of Vienna / European Academy of Neurology
Insomnia is widely recognized for disrupting nightly rest, dulling mental clarity, and impairing day-to-day productivity. However, a comprehensive international investigation led by the European Academy of Neurology (EAN) in collaboration with the Medical University of Vienna (MedUni Vienna) underscores that sleep disturbances may also serve as critical warning indicators for life-threatening vascular, neurological, and mental health conditions.
Published in Sleep Medicine Reviews, the umbrella systematic review evaluated existing epidemiological evidence across seven health endpoints: stroke, dementia, depression, suicidal behavior, mortality, workplace accidents, and hospital admissions. To establish stronger quantitative estimates, the investigators conducted dedicated new meta-analyses specifically targeting stroke, hospitalizations, and occupational accidents.
Concrete Links to Stroke and Hospital Admissions
For the stroke analysis, the research team identified nine studies encompassing more than 1.3 million participants, combining six within an extensive meta-analysis. The results demonstrated that insomnia is associated with a 26% elevated risk of stroke.
A parallel meta-analysis evaluating five studies focused on healthcare utilization discovered that individuals with chronic insomnia were 28% more likely to be hospitalized than individuals without sleep disruption.
Beyond acute cardiovascular and systemic events, the review synthesized multiple systematic reviews connecting insomnia to chronic brain and mental health pathologies. Consistent patterns emerged linking poor sleep to elevated risks of dementia, most notably Alzheimer’s disease, as well as major depression and suicidal behavior, although statistical consistency varied across individual analytical endpoints.
“Sleep should be part of the discussion on brain health at every stage of life. We should raise awareness of insomnia and its treatment and ensure that sleep is also taken into account in health promotion programmes in communities, schools and the workplace,” said study co-author Stefan Seidel, M.D., a neurologist and sleep specialist at MedUni Vienna and medical director of the Pirawarth Clinic, who initiated the study as a member of the EAN.
Interpreting Risk: Correlation, Not Direct Causation
The researchers emphasize that while the observational associations are substantial, the findings do not demonstrate a direct cause-and-effect relationship.
Discrepancies in how insomnia was clinically defined across original studies, combined with confounding variables, such as the underlying use of prescription hypnotics or baseline cardiometabolic status, warrant careful interpretation of individual risk estimates. Nonetheless, the authors conclude that chronic insomnia should no longer be treated as an isolated complaint, but rather prioritized as an early clinical red flag for declining systemic and cognitive health.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- Journal paper reviewed in full.
- Additional context added by our staff.
About this neurology Research:
- Media Contact: Karin Kirschbichler
- Source: Medical University of Vienna
- Image Credit: Image credited to Neuroscience News
- Original Research is Open Access: Sleep Medicine Reviews (Sept 22, 2026). “Insomnia as a risk factor for brain, mental and general health consequences: an umbrella systematic review.” Authors: Luca Vignatelli, Maurizio A. Leone, Elisabetta Pupillo, Stefan Seidel, Ulf Kallweit, Natalia Colorado Prieto, Maria Lolich, Marina Tüzün, and Claudio L. A. Bassetti.
- DOI: 10.1016/j.smrv.2026.102372
Abstract
Insomnia as a risk factor for brain, mental and general health consequences: an umbrella systematic review
Sleep quality is a determinant of health, and insomnia could be a risk factor for brain health. We searched MEDLINE and EMBASE (last search August 2025) to identify systematic reviews with meta-analysis (SMRAs) that evaluated insomnia as a predictive factor of dementia, stroke, depression, suicide, death, occupational injuries, and hospitalization.
Sixteen SMRA were included, and three additional original systematic reviews were conducted for stroke, occupational injuries and hospitalization, as no published SMRAs were found on these topics. SRMAs consistently identified insomnia as a predictor of dementia, depression, suicide, while death was not associated with this disorder.
Our two original SMRAs revealed that insomnia is a predictor of stroke (9 studies, 1,343,164 participants, HR = 1.26, 95%CI 1.05-1.53) and hospitalization for any reason (5 studies, 517,620 participants, OR = 1.28, 95%CI 1.14-1.43). With regard to occupational injuries, it was not possible to perform a meta-analysis of the results of the two studies retrieved (143,942 participants).
Although an association was found with unintentional fatal injuries and with commuting injuries, data should be considered insufficient to draw a conclusion on this outcome.
This work contributes to better defining the association between insomnia and the key descriptors of brain health and possible links to general health.
