Struggling to fall asleep can leave people exhausted, irritable and unable to concentrate the following day. However, new research suggests that chronic insomnia may have implications extending well beyond everyday tiredness.

A major review published in Sleep Medicine Reviews in 2026 found that people experiencing insomnia had a 26% higher relative risk of cerebrovascular event and 28% higher odds of hospital admission.

The findings highlight the importance of recognising persistent sleep difficulties, although researchers emphasise that the results do not prove insomnia directly causes these conditions.

What The Researchers Discovered

An international research team examined existing evidence connecting insomnia with neurological conditions, psychological wellbeing and general health.

They searched two major medical research databases and reviewed studies investigating cerebrovascular event, dementia, depression and other outcomes. For cerebrovascular event, the researchers identified nine studies involving more than 1.3 million participants. Six provided suitable data for a combined statistical analysis. They also examined three studies investigating hospital admissions.

The results revealed associations between insomnia and several health concerns, including cerebrovascular event, depression, dementia and suicide-related outcomes. However, the evidence did not demonstrate an association between insomnia and overall mortality.

Understanding The Increased Risk

The reported 26% increase refers to relative risk, an important distinction when interpreting medical research. It does not mean that 26% of people experiencing insomnia will suffer a cerebrovascular event. Instead, the figure compares the likelihood of cerebrovascular event among people with insomnia against those without the condition.

Individual risk also depends on factors such as age, blood pressure, diabetes and existing cardiovascular disease. Researchers therefore caution against treating the findings as a prediction of any individual's future health.

Why Poor Sleep May Affect Blood Vessels

Scientists are investigating several possible explanations for the relationship between insomnia and cardiovascular health. Persistent sleep difficulties may keep the body in a prolonged state of heightened alertness. Over time, this could contribute to increased blood pressure, inflammation and changes in blood vessel function.

These processes are relevant because cardiovascular health influences the risk of cerebrovascular event. However, further research is necessary to determine whether insomnia contributes directly to these changes or occurs alongside other underlying health problems.

When Does Insomnia Become Chronic?

Occasional sleepless nights are common and do not necessarily indicate a medical disorder. Chronic insomnia generally involves difficulty falling asleep or remaining asleep at least three nights weekly for three months or longer, alongside problems with daytime functioning.

Symptoms may include persistent fatigue, reduced concentration and difficulty managing everyday responsibilities. Recognising these patterns can help people decide when professional assessment may be appropriate.

How To Improve Sleep Quality

Regular sleeping and waking times can help support the body's natural sleep rhythm. Reducing late caffeine consumption, creating a comfortable bedroom and allowing time to unwind before bed may also improve sleep.

For persistent insomnia, cognitive behavioural therapy specifically designed for insomnia is an established treatment option. Healthcare professionals can additionally assess cardiovascular risk factors and investigate other conditions that may interfere with sleep.

What The Findings Mean

The review has limitations, including differences in how individual studies defined insomnia and measured sleeping habits. Nevertheless, its findings reinforce the importance of taking persistent sleep problems seriously.

Improving sleep may enhance everyday wellbeing, while medical assessment can help identify other health concerns requiring attention. The central message is that insomnia deserves appropriate care, even though its precise relationship with long-term disease remains under investigation.