Insomnia Linked to 26% Higher Stroke Risk, Review Finds

A Sleep Problem With Consequences Beyond the Bedroom

People who struggle to fall asleep or stay asleep may be carrying a risk factor that reaches far beyond fatigue and groggy mornings. A new review published in Sleep Medicine Reviews reports that insomnia is associated with a 26% higher risk of stroke and 28% higher odds of being admitted to hospital for any reason.

The findings, released by the European Academy of Neurology, add weight to a growing body of evidence suggesting that chronic sleeplessness is not simply an inconvenience to be endured, but a meaningful signal about a person's brain, mental and general health.

Lead author Luca Vignatelli of the IRCCS Istituto delle Scienze Neurologiche di Bologna in Italy framed the results as a call for a broader view of what insomnia represents. He noted that the condition deserves attention as a warning sign of brain and mental health status, and that the evidence shows someone with insomnia faces an elevated risk of dementia or stroke. In his view, insomnia should be recognised and addressed as part of a wider approach to health in order to reduce the risk of developing such disorders.

What the Review Examined

The research team set out to assess the full health footprint of insomnia rather than focusing narrowly on sleep quality. To do so, they searched two major medical research databases, MEDLINE and EMBASE, through August 2025.

Their approach combined evidence from previously published systematic reviews with three brand-new systematic reviews of primary studies covering stroke, occupational injuries and hospitalisation. Across the full body of work, analyses drew on more than 1.3 million participants, making the review one of the more substantial syntheses of insomnia's wider health associations.

The final review brought together evidence spanning seven distinct health outcomes, providing a panoramic view of how sleep disruption tracks with other conditions.

Stroke: A Modest but Persistent Signal

The stroke analysis rested on nine eligible studies, six of which were included in the meta-analysis. When the data were pooled, people with insomnia showed a 26% higher risk of stroke, with a hazard ratio of 1.26 and a 95% confidence interval spanning 1.05 to 1.53.

Reading the Numbers Carefully

That confidence interval is worth pausing over. While the association was statistically meaningful, the range indicates real uncertainty about the precise size of the effect, and the researchers themselves noted that the strength of the link varied substantially from one study to the next.

In practical terms, a 26% relative increase represents a meaningful elevation in risk at the population level, but it does not mean that any single individual with insomnia will go on to have a stroke. The review describes an association, not a verdict on any one person's future.

Hospital Admissions and Mental Health Outcomes

Beyond stroke, the review turned up several other concerning patterns. Five studies looked at hospitalisation, three of which fed into the meta-analysis. Those results indicated that people with insomnia had 28% higher odds of being admitted to hospital for any reason, reported as an odds ratio of 1.28.

The researchers also found insomnia to be associated with depression and suicidal behaviours. Separately, the evidence suggested a link with dementia, particularly Alzheimer's disease, though the authors characterise this as a suggested relationship rather than a confirmed one.

Taken together, the outcomes paint a picture of insomnia as a condition that intersects with neurological, psychological and general medical health simultaneously.

How Common Is Insomnia?

The scale of the issue matters when interpreting these findings. A previous meta-analysis estimated that insomnia meeting international diagnostic criteria affects roughly 22% of the general population.

Clinically, insomnia is defined not merely as short sleep but as difficulty falling or staying asleep combined with impaired daytime functioning, occurring despite adequate opportunity for sleep. That distinction separates a clinical disorder from occasional restless nights, and it is the clinical form that the review's evidence addresses.

From Symptom to Warning Sign

The researchers argue that their findings support recognising insomnia as an important marker of brain, mental and general health. That framing represents a notable shift. Rather than treating insomnia as an isolated complaint to be managed with sleep hygiene advice alone, the review positions it as a signal that may warrant a wider health assessment.

The authors emphasise that these results add to growing evidence that insomnia's implications extend well beyond poor sleep and reduced daytime functioning. If the associations hold, clinicians who encounter persistent insomnia might reasonably consider it a prompt to look more broadly at cardiovascular and neurological risk factors.

What Remains Unanswered

• Cause versus consequence: The review synthesises observational evidence, which cannot establish whether insomnia directly contributes to stroke, dementia and hospitalisation, or whether shared underlying factors drive both.
• Inconsistent effect sizes: The variability between studies on stroke risk suggests that population characteristics, definitions of insomnia and follow-up periods may all influence results.
• Dementia evidence: The link with dementia, especially Alzheimer's disease, is described as suggested rather than established.
• Occupational injuries: This outcome was included in the scope of the new systematic reviews, though the headline findings centre on stroke, hospitalisation and mental health.

The Bottom Line

For the roughly one in five adults who meet diagnostic criteria for insomnia, the review offers a reason to take the condition seriously rather than dismiss it as a tolerable part of modern life. The 26% higher stroke risk and 28% higher odds of hospital admission are relative figures drawn from pooled data, and the confidence intervals and between-study variation counsel against overstatement.

Still, the message from the authors is straightforward: insomnia should be recognised and addressed as part of a wider approach to health. Whether that means earlier screening for vascular and neurological risk, or simply treating sleep complaints as clinically relevant rather than cosmetic, the review suggests the stakes of sleeplessness are higher than many people assume.

This article is based on reporting by Medical Xpress. Read the original article.