The link between sleep and heart health

Sleep does more than help you feel rested—it plays an important role in keeping your heart healthy. The American Heart Association includes sleep among its eight essential behaviors and factors for heart health. Read on to learn how sleep affects your heart, signs that poor sleep may be taking a toll, and practical ways to get more—and better—rest.

Why sleep matters for heart health

Your circadian system governs many physiological processes. You might know it best for its role in regulating sleep and wake cycles. But it also plays a role in cardiometabolic function and overall heart health. 

Sleep helps regulate blood pressure, heart rate and stress hormones. It also supports the body’s ability to repair and restore blood vessels. Both sleeping too little and getting poor-quality sleep can interfere with these protective processes. 

High-quality sleep means falling asleep without difficulty and staying asleep most of the night. It also means waking up feeling reasonably refreshed. Most adults need between 7 and 9 hours of high-quality rest.

How poor sleep affects the heart

When sleep is disrupted, the body stays in a more “activated” state, which can place extra strain on the heart over time. Poor sleep can also make it harder to maintain other heart‑healthy habits. It’s harder to eat well, manage stress and stay active when you’re tired!

Long-term disruptions to sleep can lead to:

• Weight gain and insulin resistance

• High blood pressure and inflammation

• Coronary artery disease and increased risk for heart attack

• Prediabetes and type 2 diabetes

• Heart failure

Sleep disorders and heart disease risk

Certain sleep disorders can further increase strain on the heart, especially when left untreated.

Obstructive sleep apnea (OSA) is one of the sleep disorders most strongly linked to cardiovascular risk. It causes repeated pauses in breathing during sleep, leading to drops in oxygen levels and frequent wakings. Over time, this can raise blood pressure, increase stress hormones and contribute to inflammation.

Insomnia and restless or fragmented sleep can be related to chronic pain or other medical conditions. Both can interfere with the body’s ability to rest and recover.

These sleep disorders are more common in people with diabetes, high blood pressure or obesity. This is in part because these conditions affect breathing, circulation and hormone regulation during sleep. Poor sleep, in turn, can worsen blood sugar control, raise blood pressure and make weight management more difficult.

When untreated, sleep disorders can aggravate existing heart conditions. They keep the body in a prolonged state of stress. That increases the risk of complications such as heart rhythm problems, heart attack and heart failure.

Signs your sleep may be affecting your heart

Sleep problems can cause more symptoms than simply feeling tired. Over time, they can affect your heart in noticeable ways, including the following:

• You regularly get too little sleep. Consistently sleeping fewer than 7 hours a night has been linked to higher blood pressure and increased heart disease risk.

• You wake up feeling unrefreshed. Ongoing fatigue may signal poor-quality sleep that interferes with the body’s repair processes.

• Your blood pressure is elevated or hard to control. Disrupted sleep can prevent the normal nighttime drop in blood pressure.

• You snore loudly or wake up gasping for air. These may be signs of sleep apnea, a condition strongly associated with heart disease and stroke.

• You struggle with weight, blood sugar or stress. Poor sleep can affect hormones that regulate appetite, metabolism and stress—all important for heart health.

Ways to support better sleep and heart health

The American Heart Association recommends four steps to get better sleep:

Dim it. Avoid bright lights close to bedtime to help signal to your body that it’s time to sleep. Use softer lighting in the evening and turn off screens about an hour before bed, or use blue‑light filters.

Set it. Keep a regular sleep and wake time to support your internal clock—even on weekends.

Create it. Build a calming bedtime routine that helps your body and mind wind down. Try reading, stretching or enjoying a cup of herbal tea.

Block it. Put your phone and other devices on “do not disturb” so notifications don’t interrupt your wind‑down time or sleep.

In addition to good sleep habits, managing chronic conditions that may affect sleep is important. Maybe you suspect sleep apnea or are struggling with ongoing sleep problems. Your rest and your heart may be impacted. Be sure to discuss with your healthcare provider. 

The bottom line

Sleep is a critical—but often overlooked—part of heart health. Prioritizing good sleep helps you feel better day to day. It also supports long‑term cardiovascular health. If you’re having trouble getting enough sleep or your sleep quality is poor, take a closer look at your bedtime routine. Consider small changes that may help. And if chronic conditions are affecting both your sleep and your heart, seeking care is an important step.