Everyone has a bad night now and then. A review published recently in Sleep Medicine Reviews is about something different: insomnia that sticks around, and what it may say about the rest of your health. Its headline numbers, a 26% higher risk of stroke and 28% higher odds of hospital admission, have been all over health news in recent weeks. They sound scarier than they are until you know what they mean.
What the Review Looked At
The paper, by Luca Vignatelli and colleagues and supported by the European Academy of Neurology, is an umbrella review, meaning a review of existing reviews. The team searched two major databases, MEDLINE and EMBASE, through August 2025 and gathered evidence on seven outcomes: dementia, stroke, depression, suicidal behaviour, death from any cause, workplace accidents and hospital admission. Where no good meta-analysis existed for stroke, workplace injuries and hospitalisation, they ran three new systematic reviews of their own.
The Numbers
The stroke analysis drew on nine studies covering more than 1.3 million people. Those with insomnia had a 26% higher risk of stroke than those without (hazard ratio 1.26, 95% confidence interval 1.05 to 1.53). That interval is wide: the plausible range runs from a risk about 5% higher to one about 53% higher, and the size of the link varied a lot between studies. For hospital admission, three of five eligible studies fed into the analysis, and people with insomnia had 28% higher odds of being admitted for any reason (odds ratio 1.28, 95% CI 1.14 to 1.43).
The review also linked insomnia with depression and suicidal behaviour, and the evidence suggested a connection with dementia, Alzheimer’s disease in particular. “Suggested” is deliberate: that part is weaker than the stroke and hospitalisation findings.
A relative increase is not the same as a likelihood. A 26% higher risk doesn’t mean 26% of people with insomnia will have a stroke. As an illustration only, with made-up baseline figures: if the risk over some period were 2 in 100, a 26% relative increase would take it to roughly 2.5 in 100. Across millions of people that’s a real difference, and it’s a long way from a prediction for any one person.
What It Doesn’t Show
The authors were explicit that the review finds associations and doesn’t prove that insomnia causes stroke or anything else. People with insomnia may have other health conditions or lifestyle factors that explain part of the higher risk. Earlier research has described the relationship between insomnia and stroke as possibly running both ways, since a stroke can itself disrupt sleep. And the studies didn’t always define insomnia the same way, which may be part of why results varied.
The reading the researchers support is a modest one: persistent insomnia may be a useful marker of broader brain, mental and general health. It’s a reason to take the problem seriously, not a verdict.
A Bad Night Isn’t Insomnia Disorder
The findings concern chronic insomnia, which has a specific clinical meaning: trouble falling or staying asleep at least three nights a week for three months or longer, with daytime consequences such as tiredness, poor concentration or low mood. In the US, an estimated 6% to 10% of adults meet that definition. A stressful week, a noisy hotel room or a few nights of jet lag doesn’t count, and nothing in this review suggests those are cause for alarm.
Disrupted sleep from shift work is a related but separate problem, caused by a body clock out of step with the schedule rather than an inability to sleep when given the chance. Both deserve attention. They just aren’t the same condition.
What Has the Strongest Evidence for Treatment
For chronic insomnia, the first-line treatment isn’t a pill. The American College of Physicians recommends cognitive behavioural therapy for insomnia, usually shortened to CBT-I, as the initial treatment for every adult with chronic insomnia, and gave that recommendation a strong grade. The American Academy of Sleep Medicine also strongly recommends multicomponent CBT-I, and suggests that general sleep-hygiene advice shouldn’t be the only treatment.
CBT-I is a structured programme, usually run over several weeks. It combines education about sleep with behavioural changes, such as keeping a consistent sleep window, using the bed only for sleep and getting up when you’ve been lying awake for a long time. It also works on the worry and unhelpful thoughts about sleep that keep the problem going. Parts of it, particularly deliberately limiting time in bed, can need adjusting or avoiding for some people, for example those with bipolar disorder. That’s one good reason to do it with a trained clinician or a properly designed programme, and many are now delivered online. Sleep medicines have a place for some people, but the ACP’s guidance is that they’re best kept short term, while CBT-I builds skills meant to last after treatment ends.
If Sleep Is a Regular Struggle
Keep a simple diary for two weeks: when you went to bed, roughly how long you took to fall asleep, how often you woke, and how you felt the next day. It gives a doctor something concrete to work with. If you recognise the pattern above, three nights a week for three months, or your days are suffering, book an appointment rather than waiting it out. A doctor can also check for other conditions that disturb sleep.
The same goes for mood. If sleepless nights come with persistent low mood, hopelessness or thoughts of harming yourself, please talk to a doctor or someone you trust soon instead of managing it alone.
Whatever your sleep looks like, keeping blood pressure in check is one of the most useful things you can do for stroke prevention. Even a single short night of sleep can reduce insulin sensitivity, which is another reason sleep counts as health and not just comfort. And if racing thoughts are what keep you awake, slow breathing and grounding techniques can help you wind down, though for chronic insomnia they supplement CBT-I and don’t replace it.
Months of bad nights deserve the same attention as any other symptom that won’t go away. The treatment with the strongest evidence behind it is a set of skills you can learn, not something you have to keep taking.