Sleep problems deserve the same clinical attention as smoking cessation
Among those who have already survived one cardiac crisis, nearly half are lying awake at night — and that sleeplessness, a Norwegian study now suggests, is not merely a symptom of worry but a force quietly shaping their odds of survival. Presented at a European cardiology conference, the research followed more than a thousand heart patients over four years and found that insomnia ranked third among modifiable risk factors for recurrent cardiac events, behind only smoking and physical inactivity. The finding places something as intimate and invisible as a restless night alongside the most established dangers in cardiovascular medicine, and asks clinicians to look more carefully at what happens when their patients close their eyes.
- Nearly half of heart disease patients in the study reported insomnia at enrollment, revealing a silent and largely unaddressed burden sitting at the center of cardiac recovery.
- Over 4.2 years, 225 patients suffered major cardiac events — heart attacks, strokes, heart failure, or cardiovascular death — and insomnia was independently linked to a measurable share of that toll.
- Insomnia accounted for 16% of recurrent cardiac events, placing it third among risk factors and suggesting that one in six such events might have been preventable with proper sleep treatment.
- Researchers are now calling for routine insomnia screening in cardiac care, but the field lacks consensus on which interventions — cognitive behavioral therapy, digital tools — are ready for standard prescription.
- The study challenges the traditional silos of cardiology and sleep medicine, making the case that a patient's night is as clinically relevant as their smoking history or exercise habits.
More than a thousand people who had survived a heart attack or undergone arterial surgery were asked at the start of a study whether they had trouble sleeping. Nearly half said yes. What followed over the next four years became the basis of a striking finding presented at a European cardiology conference: insomnia was not simply a byproduct of stress in these patients — it was an independent risk factor for future cardiac harm.
Among the 225 patients who experienced a recurrent major cardiac event, insomnia accounted for 16 percent of those outcomes. That placed it third among identifiable risk factors, behind smoking at 27 percent and physical inactivity at 21 percent. The average participant was 62 years old, and a quarter had taken sleep medication in the week before the study began. Crucially, the link between insomnia and cardiac events held even after accounting for smoking status, exercise, existing conditions, and mental health.
Lars Frojd, a medical student at the University of Oslo who led the research, drew a pointed conclusion: had none of the participants experienced insomnia, roughly one-sixth of recurrent events might have been prevented. For a population already made vulnerable by one cardiac crisis, the quality of their sleep emerges as a meaningful lever for what comes next.
The clinical implication is clear — cardiologists should be screening for and treating sleep disorders — yet the research community has not settled on which interventions are ready for standard care. Cognitive behavioral therapy and digital sleep tools show promise, but evidence remains limited. The deeper question the study raises is why insomnia is not already part of routine cardiac rehabilitation, assessed with the same urgency as blood pressure or exercise capacity. The data now make a case that it should be.
More than a thousand people who had survived a heart attack or undergone surgery to clear blocked arteries were asked a simple question at the start of a study: Do you have trouble sleeping? Nearly half said yes. Over the next four years, researchers watched what happened to them.
The answer, presented this week at a European cardiology conference, was sobering. Among the 225 patients who experienced another major cardiac event—a second heart attack, a stroke, heart failure, or death from heart disease—insomnia played a measurable role. The sleep disorder accounted for 16 percent of these recurrent events, making it the third most significant risk factor the researchers could identify, trailing only smoking at 27 percent and physical inactivity at 21 percent.
The study, which followed patients for an average of 4.2 years after their initial cardiac event or intervention, included 364 major adverse cardiovascular events in total. At enrollment, 45 percent of the 1,000-plus participants reported struggling with insomnia, and a quarter had taken sleep medication in the week before the study began. The average age was 62. What emerged from the data was a clear pattern: sleep problems were not merely a symptom of stress or anxiety in these patients. They were an independent risk factor, linked to subsequent heart trouble regardless of smoking status, exercise habits, existing health conditions, or mental health symptoms.
Lars Frojd, a medical student at the University of Oslo who led the research, framed the finding in stark terms. If none of the study participants had experienced insomnia, he suggested, roughly one-sixth of the recurrent cardiac events might have been prevented. That is not a trivial number. It means that among people already vulnerable—those who have already had one cardiac event—the quality of their sleep becomes a measurable lever for their future health.
The implication for clinical practice is direct: cardiologists should be screening their patients for sleep problems and treating them. Yet the research community has not yet settled on which treatments work best. Cognitive behavioral therapy and digital applications designed to improve sleep show promise, but Frojd acknowledged that more evidence is needed before doctors can confidently prescribe these interventions as part of standard cardiac care.
What makes this finding particularly relevant is how common insomnia is in this population. Nearly half of heart disease patients struggle with it. They are not a fringe group. They are the majority of people walking out of hospitals after a cardiac event, many of them lying awake at night, their minds racing or their bodies restless. The study suggests that this widespread problem deserves the same clinical attention as smoking cessation programs or exercise prescriptions—interventions that cardiologists already consider non-negotiable.
The research opens a question that extends beyond the study itself: if sleep problems are this significant a risk factor, why are they not routinely assessed and treated in cardiac rehabilitation? The answer likely involves both the complexity of sleep medicine and the traditional silos within cardiology. But the data now make a case for change. For the next generation of cardiac patients, screening for insomnia may become as routine as checking blood pressure.
Citas Notables
Insomnia is common in heart disease patients and is linked with subsequent cardiovascular problems regardless of risk factors, coexisting health conditions and symptoms of mental health— Lars Frojd, lead researcher, University of Oslo
16% of recurrent major adverse cardiovascular events might have been avoided if none of the participants had insomnia— Lars Frojd
La Conversación del Hearth Otra perspectiva de la historia
Why does insomnia matter more than, say, diet or cholesterol levels in this study?
The study didn't measure diet or cholesterol as risk factors—it focused on behavioral and lifestyle factors. But the point is that insomnia ranked third overall, which is striking because it's often overlooked. Cardiologists treat smoking and inactivity aggressively. Sleep problems get less attention, even though the data suggest they shouldn't.
The study says 16 percent of events could have been prevented. That's a lot, but it's also not everything. What about the other 84 percent?
Right. Smoking and inactivity together account for 48 percent. There are other factors too—genetics, diet, medication adherence, stress. The point isn't that insomnia is the biggest problem. It's that it's a significant, treatable problem that's being ignored.
Why would sleep problems specifically trigger another heart attack or stroke in someone who's already had one?
The mechanisms aren't fully clear from this study, but sleep deprivation affects blood pressure, inflammation, and how the heart regulates its rhythm. In someone whose cardiovascular system is already compromised, those effects can be dangerous.
The study mentions cognitive behavioral therapy as a potential treatment. Is that proven to work for cardiac patients?
Not yet. That's why Frojd said more research is needed. There's evidence it works for insomnia in general populations, but whether it actually reduces cardiac events in this specific group—that's still an open question.
What strikes you most about the numbers?
That 45 percent of cardiac patients have insomnia at baseline. That's not a small problem hiding in the data. That's nearly half of everyone who walks out of a hospital after a heart attack. If you're a cardiologist, you're seeing this constantly and probably not addressing it.