Joseph Nano Cardiovascular Disease, Sleep

Bad Sleep, Higher Heart Risk: What a 2025 Review Means for Your Health

New analysis links short sleep, poor sleep quality, and common sleep disorders to coronary heart disease—and explains why.

At a glance

  • Adults who routinely sleep too little face a higher risk of coronary heart disease (CHD). Several large studies summarized in a 2025 review show a clear link between short sleep and later heart problems. Many studies also find a “U‑shaped” pattern—risk rises at the extremes (too little or too much)—though genetic analyses suggest the causal signal is strongest for short sleep.  
  • Sleep quality matters on its own: even with “normal” hours in bed, restless, fragmented, or non‑restorative sleep is tied to more heart attacks and major cardiovascular events.  
  • Common sleep disorders—insomnia, obstructive sleep apnea (OSA), and restless legs syndrome (RLS)—are all associated with higher heart risk; in people with existing heart disease, they’re linked to worse outcomes. OSA is widespread and frequently undiagnosed; treatment (such as CPAP) improves symptoms and blood pressure, though studies differ on how much it cuts future events.  
  • Why sleep affects the heart: the review highlights biological pathways—inflammation, oxidative stress, overactive “fight‑or‑flight” signals, metabolic/hormone disruption, and blood‑clotting changes—that can accelerate atherosclerosis (plaque build‑up). The diagram on page 2 maps these mechanisms from poor sleep to coronary disease.  

What’s new here?

Researchers from Central China Fuwai Hospital and collaborators pulled together recent evidence on sleep and CHD, covering sleep duration, sleep quality, and sleep disorders. Their bottom line: sleep isn’t just “nice to have”—it is a core pillar of heart health, now recognized by the American Heart Association’s “Life’s Essential 8.”  

The authors note that 7–9 hours per night is a sensible target for most adults. Consistently sleeping less than that, or sleeping poorly, was tied to higher odds of angina, heart attacks, and other major events in multiple long‑term studies reviewed. Some analyses suggest longer‑than‑average sleep may also track with risk, but newer genetic data point to short sleep as the more clearly causal culprit.  

The disorders to watch for

  • Insomnia (trouble falling or staying asleep, at least 3 nights/week for 3+ months) is common and associated with a higher risk of heart attack and repeat cardiac events—even after accounting for other risk factors.  
  • Obstructive sleep apnea (OSA) causes loud snoring, gasping/choking at night, and daytime sleepiness. In people with heart disease, OSA is tied to more unstable plaques, more calcification, and a higher rate of future events. CPAP therapy improves sleepiness and blood pressure and may lower risk, but trial results are mixed for long‑term event reduction.  
  • Restless legs syndrome (RLS)—an urge to move the legs that worsens at night—has been linked to higher rates of adverse cardiac outcomes in moderate‑to‑severe cases, especially in men.  

How sleep may harm (or help) your heart

Poor or short sleep can turn up inflammation (higher IL‑6, TNF‑α, CRP), raise oxidative stress, and over‑activate the sympathetic nervous system—speeding heart rate and blood pressure and impairing blood vessel function. Sleep loss also disrupts metabolism (more insulin resistance, weight gain) and can tip the blood toward clotting—all of which promote coronary plaque growth and instability. (See the mechanisms figure on page 2 of the paper.)  

What you can do today

  • Aim for consistency: go to bed and wake up at the same time daily; keep the bedroom dark, quiet, and cool; limit late caffeine and screens.  
  • Screen for apnea: talk to your clinician if you snore loudly, wake up choking, or feel very sleepy by day—especially if you have high blood pressure or known heart disease. Diagnosis and treatment can be game‑changing.  
  • Treat insomnia: cognitive behavioral therapy for insomnia (CBT‑I) is the gold‑standard, medication‑sparing approach with lasting benefits.  
  • Remember the big picture: sleep works alongside healthy eating, activity, blood‑pressure and cholesterol control, and not smoking.

Bottom line: Sleep is not a luxury. The 2025 review concludes that protecting your sleep—its quantity and quality—is a practical, evidence‑based way to protect your heart. If sleep problems persist, bring them to your doctor just as you would any other risk factor.  

Source: “The Correlation Between Sleep and Coronary Heart Disease: A Review,” Rev. Cardiovasc. Med. (2025).  

Editor’s note: This article is for information only and is not a substitute for professional medical advice.