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Oct 1, 202623 views2 min read

Insomnia Linked to 26 Percent Higher Stroke Risk and 40 Percent Greater Chance of Cognitive Decline

New research published in Sleep Medicine Reviews and Neurology finds that insomnia raises stroke risk by 26 percent and increases the likelihood of cognitive impairment by 40 percent. Experts say the risks are modifiable with proper treatment.

Insomnia Linked to 26 Percent Higher Stroke Risk and 40 Percent Greater Chance of Cognitive Decline
Source:Healthline

New research links insomnia to a 26% higher risk of stroke and a 40% greater chance of cognitive impairment, according to studies published in Sleep Medicine Reviews and Neurology.

A meta-analysis in Sleep Medicine Reviews found that persistent sleep disruption triggers overactivation of the sympathetic nervous system. This leads to elevated adrenaline and cortisol, higher blood pressure, systemic inflammation, and disrupted glucose and lipid metabolism. These changes can promote plaque formation and raise stroke risk.

A separate study published September 9, 2026, in Neurology tracked 2,750 participants and found that those with insomnia had a 40% increased risk of cognitive impairment. Researchers classified insomnia as a "modifiable risk factor" for cognitive decline.

Experts say the brain clears metabolic waste during healthy sleep, including substances like amyloid-beta and tau that are linked to neurodegeneration. Insomnia may impair this process, raising the risk of Alzheimer's disease and other forms of dementia.

The good news is that these risks appear to be reversible. Participants who increased their sleep duration or received treatment for insomnia showed less cognitive harm over time.

Doctors recommend maintaining a regular sleep schedule, keeping the bedroom cool and dark, and avoiding screens for 30 to 60 minutes before bed. Anyone with persistent insomnia should consult a sleep specialist to identify underlying causes.

The findings add to a growing body of evidence that sleep is a critical factor in long-term brain and heart health.

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