Insomnia and Stroke: What Does a 26% Higher Risk Mean?

What did the new review find about insomnia and stroke?

The research, led by Luca Vignatelli and colleagues, examined insomnia alongside seven areas of health. Its stroke review identified nine eligible studies involving approximately 1.34 million people. Six studies contributed to the pooled stroke estimate, which produced a hazard ratio of 1.26. This describes a higher relative rate of stroke over follow-up among people with insomnia. [Sleep Medicine Reviews](https://www.sciencedirect.com/science/article/pii/S1087079226001449); [European Academy of Neurology release](https://sciencesources.eurekalert.org/news-releases/1145068).

The team combined existing systematic reviews with newly conducted reviews covering stroke, hospitalization and occupational injuries. Searches extended through August 2025. This was a synthesis of observational evidence, rather than an experiment assigning people to sleep treatments. Its clinical value lies in identifying insomnia as a potential health marker and clarifying questions for future research. [Study methods and findings](https://www.sciencedirect.com/science/article/pii/S1087079226001449).

Does the association mean insomnia causes strokes?

The researchers highlighted differences in how studies defined insomnia and limited accounting for sleep medication use. Both insomnia symptoms and formal diagnoses were eligible, without a required minimum symptom duration. These differences make it difficult to treat the pooled estimate as a precise prediction for every person with sleep difficulties. The authors explicitly caution that their findings do not establish causation. [European Academy of Neurology explanation](https://sciencesources.eurekalert.org/news-releases/1145068).

A 26% higher relative hazard does not mean that 26% of people with insomnia will have a stroke, or that their risk rises by 26 percentage points. Translating the association into an absolute probability requires a person's baseline risk and a defined follow-up period. The practical interpretation is that persistent insomnia warrants attention, while the review alone cannot show that correcting sleep problems will prevent strokes.

The European Academy of Neurology funded the research. The project also received independent scientific grants from Idorsia, Jazz Pharmaceuticals and Takeda; the disclosure states that these companies did not influence study design, analysis or interpretation. [Funding disclosure](https://sciencesources.eurekalert.org/news-releases/1145068).

How should people address persistent insomnia and stroke risk?

Sleep problems that interfere with daily functioning deserve medical attention. The National Heart, Lung, and Blood Institute describes chronic insomnia as difficulties occurring at least three nights weekly for three months or longer. Evaluation considers sleep schedules, medicines, other illnesses and symptoms such as loud snoring or waking while gasping. Keeping a sleep diary for one to two weeks can help a clinician understand the pattern. [NHLBI diagnosis guidance](https://www.nhlbi.nih.gov/health/insomnia/diagnosis).

Cognitive behavioral therapy for insomnia, or CBT-I, is usually the first treatment recommended for long-term insomnia. It addresses worries about sleep and behaviors that maintain wakefulness, using structured approaches to sleep timing, relaxation and the association between bed and sleep. NHLBI describes a typical course as six to eight weeks, with options for in-person, telephone or online delivery. Medicines require an individual discussion of benefits and adverse effects. [NHLBI treatment guidance](https://www.nhlbi.nih.gov/health/insomnia/treatment).

Sleep care should sit alongside established stroke prevention. CDC guidance emphasizes controlling blood pressure, managing diabetes and cholesterol, treating relevant heart conditions, avoiding smoking and getting regular physical activity. These remain actionable priorities while researchers investigate whether treating insomnia itself changes stroke outcomes. [CDC stroke-prevention guidance](https://www.cdc.gov/stroke/prevention/index.html).