Can Poor Sleep Cause Heart Problems? What to Know

Key takeaways:

• Sleep deprivation and heart disease are closely connected. Poor sleep raises your risk of high blood pressure, heart attack, and stroke over time.

• Sleep gives your heart and blood vessels time to recover. Without enough shut-eye, your body stays in a stressed state that wears down your cardiovascular system.

• Sleep apnea is one of the strongest sleep-related risk factors for heart disease.

• Adults should aim for 7 to 9 hours of quality sleep each night to support heart health.

Your heart never stops working. But it does get a break—when you sleep.

During sleep, your heart rate slows, your blood pressure drops, and stress hormones fall to their lowest point of the day. This nightly recovery period gives your cardiovascular system a chance to repair and reset.

When sleep falls short, that recovery doesn't happen. And over time, the consequences add up.

In 2022, the American Heart Association (AHA) added sleep to its official checklist for heart health, putting it alongside factors like diet, exercise, and cholesterol. That change reflected what cardiologists have observed for years: sleep and cardiovascular health are deeply connected.

How does sleep affect your heart?

Sleep affects your heart through several pathways, most of which involve your nervous system and hormones.

When you're awake, your sympathetic nervous system—the one responsible for your "fight or flight" response—keeps your body active. Your heart beats faster, your blood vessels stay constricted, and stress hormones like cortisol circulate at higher levels.

Sleep shifts you into a different mode. Your parasympathetic nervous system takes over, slowing your heart rate and relaxing your blood vessels. Blood pressure drops by 10% to 20% during deep sleep, a pattern doctors call "nocturnal dipping."

Poor sleep disrupts this cycle. Your body spends more time in that alert, stressed state, and less time recovering. Over weeks and months, this imbalance takes a toll on your heart and blood vessels.

Also Read: Why Sleep is Important for Your Health

What happens to your heart when you don't sleep enough?

Sleep deprivation affects your heart in different ways.

• Your blood pressure stays elevated. Without that nightly dip, your blood vessels don't get relief from the pressure they're under during waking hours. Even one night of poor sleep can raise blood pressure the next day. When this becomes a pattern, it can lead to sustained hypertension. 

• Inflammation increases. Sleep deprivation raises inflammatory markers like C-reactive protein. Chronic inflammation damages artery walls and contributes to plaque buildup, a condition called atherosclerosis. 

• Your metabolism shifts. Poor sleep interferes with insulin sensitivity and blood sugar regulation. This increases your risk of type 2 diabetes, which is itself a major risk factor for heart disease.

• Stress hormones stay high. Cortisol and adrenaline remain elevated when you're sleep-deprived, keeping your heart working harder than it should.

Sleep deprivation and heart disease are connected through these same mechanisms. None of these changes happens after one bad night, but weeks and months of poor sleep create cumulative damage.

Can lack of sleep cause high blood pressure?

Yes. The connection between insufficient sleep and high blood pressure is well established.

People who sleep fewer than 5 hours per night have significantly higher rates of hypertension than those who get 7 to 8 hours. Irregular sleep schedules—where your bedtime and wake time vary widely from day to day—also increase risk.

So does insomnia cause high blood pressure? The evidence suggests it can. Chronic insomnia keeps your body in a prolonged stress response, which over time elevates baseline blood pressure levels.

The connection works both ways. High blood pressure can disrupt sleep, and disrupted sleep can raise blood pressure. This creates a cycle that's hard to break without addressing both issues.

Nearly half of American adults have high blood pressure, and many don't know it. If you're consistently sleeping poorly, it's worth checking your numbers.

Also Read: Harvard Researchers Find that a Good Night’s Sleep Can Add Years to Your Life

Is sleep apnea bad for your heart?

Yes. Sleep apnea is one of the most significant sleep-related risk factors for heart disease.

In obstructive sleep apnea (OSA), your airway repeatedly collapses during sleep, cutting off airflow for seconds at a time. These episodes can happen dozens or even hundreds of times per night. Each time, oxygen levels in your blood drop, and your body reacts as if it's under threat.

This triggers a cascade of effects: your nervous system activates, your blood vessels constrict, inflammation rises, and your heart works harder to compensate. Over time, this leads to sustained high blood pressure, increased risk of heart attack, and higher rates of stroke and heart failure.

The sleep apnea heart risk connection is dose-dependent. The worse the sleep apnea, the greater the cardiovascular risk. But even mild cases can cause problems if left untreated. 

Treatment—usually with a CPAP machine that keeps the airway open—can significantly reduce these risks. Blood pressure often improves within weeks of starting therapy.

Can lack of sleep cause a heart attack?

Lack of sleep can increase the risk of a heart attack, although it is rarely the only cause. People with insomnia are 69% more likely to have a heart attack than those who sleep well. If someone sleeps five hours or less each night, their risk is even higher. For individuals who have both diabetes and insomnia, the risk of a heart attack roughly doubles.

The reasons for this link include high blood pressure, chronic inflammation, metabolic issues, and ongoing stress on the heart. These factors don't lead to heart attacks right away, but they create conditions that can result in one over time.

Sleep problems in your 30s and 40s can lead to heart damage years later. One 2008 study found that adults who slept less than 6 hours each night during midlife had more calcium buildup in their coronary arteries later on. This buildup is a sign of heart disease risk, even after considering other lifestyle factors.

Also Read: People With Insomnia Have 51% Higher Chance of Stroke

How many hours of sleep do you need to prevent heart disease?

Most adults need 7 to 9 hours of sleep per night for optimal cardiovascular health. Sleeping fewer than 7 hours regularly is associated with increased risk of high blood pressure, heart attack, and stroke.

But quantity alone doesn't tell the whole story. Sleep quality matters too.

Fragmented sleep—where you wake up multiple times during the night—can be nearly as harmful as short sleep. Your body needs uninterrupted time to cycle through the deeper stages of sleep where most cardiovascular recovery happens.

Signs that your sleep quality may be poor include:

• Waking up tired even after a full night in bed

• Feeling drowsy during the day

• Snoring loudly or gasping during sleep

• Waking frequently throughout the night

If any of these sound familiar, it's worth talking to a healthcare provider. A sleep study can identify disorders like sleep apnea that might be undermining your rest.

What can you do to improve sleep and protect your heart?

Sleep habits respond well to consistent changes. You don't need to overhaul your life—small adjustments often make a noticeable difference within a few weeks.

Stick to a schedule. Going to bed and waking up at the same time every day helps regulate your body's internal clock. This includes weekends.

Get morning light. Exposure to natural light early in the day reinforces your circadian rhythm and makes it easier to fall asleep at night.

Move during the day. Regular physical activity improves both sleep quality and heart health. Just avoid intense exercise within a few hours of bedtime.

Cut back on screens at night. Blue light from phones and computers can suppress melatonin and make it harder to fall asleep. Try to put devices away at least an hour before bed.

Watch what you consume. Caffeine, alcohol, and heavy meals close to bedtime can all interfere with sleep. Alcohol might help you fall asleep faster, but it disrupts sleep quality later in the night.

Make your bedroom a sleep zone. Keep the room cool, dark, and quiet. Reserve your bed for sleep rather than work or scrolling.

For people who struggle with racing thoughts or tension at night, a gentle sleep aid can help ease the transition. Sip2Sleep® combines Montmorency tart cherry extract—a natural source of melatonin with anti-inflammatory properties—with Rafuma leaf extract, which has traditionally been used to promote calm and relaxation before bed. 

If sleep problems persist despite these changes, talk to your doctor. Underlying conditions like sleep apnea or chronic insomnia often require targeted treatment.

The bottom line

Sleep gives your heart the downtime it needs to recover from each day. When that recovery gets cut short—night after night—the effects accumulate.

Poor sleep is linked to high blood pressure, inflammation, metabolic problems, and increased risk of heart attack and stroke. Sleep disorders like sleep apnea amplify these risks significantly.

The good news: sleep is something you can improve. Building good sleep hygiene and addressing any underlying disorders can meaningfully reduce your cardiovascular risk over time.

Your heart works hard for you. Giving it 7 to 9 hours of rest each night is one of the simplest ways to return the favor.

Frequently asked questions

Can your heart recover from lack of sleep?

Yes, in most cases. Your cardiovascular system can recover from short-term sleep deprivation once you return to healthy sleep patterns. However, years of chronic poor sleep may cause lasting changes to your blood vessels and heart. The sooner you address sleep problems, the better your chances of reversing any damage.

What are the first signs that poor sleep is affecting your heart?

Early warning signs include elevated blood pressure readings, increased resting heart rate, and feeling your heart race or pound when you haven't been physically active. Persistent fatigue, even after time in bed, can also indicate your cardiovascular system isn't getting the recovery it needs.

Does sleeping too much hurt your heart?

Possibly. Sleeping more than 9 hours per night has been linked to higher rates of cardiovascular problems, though the reasons aren't entirely clear. People who sleep excessively tend to be less physically active and may have underlying health conditions contributing to both the long sleep and the heart risk.

Can fixing your sleep lower blood pressure?

Yes. Improving sleep quality and duration can help lower blood pressure, especially if sleep problems were contributing to elevated readings. Treating sleep apnea with a CPAP machine often produces noticeable drops in blood pressure within weeks. Consistent sleep hygiene improvements can also make a difference over time.

Reference:

1. Centers for Disease Control and Prevention. (2024, May 15). About sleep and your heart health. U.S. Department of Health and Human Services. https://www.cdc.gov/heart-disease/about/sleep-and-heart-health.html

2. Centers for Disease Control and Prevention. (2024, October 24). Heart disease facts. U.S. Department of Health and Human Services. https://www.cdc.gov/heart-disease/data-research/facts-stats/index.html

3. Reichenberger DA, Ness KM, Strayer SM, Mathew GM, Schade MM, Buxton OM, Chang AM. Recovery Sleep After Sleep Restriction Is Insufficient to Return Elevated Daytime Heart Rate and Systolic Blood Pressure to Baseline Levels. Psychosom Med. 2023 Oct 1;85(8):744-751. doi: 10.1097/PSY.0000000000001229. Epub 2023 Jun 27. PMID: 37363991; PMCID: PMC10543608.

4. Sá Gomes E Farias AV, de Lima Cavalcanti MP, de Passos Junior MA, Vechio Koike BD. The association between sleep deprivation and arterial pressure variations: a systematic literature review. Sleep Med X. 2022 Jan 26;4:100042. doi: 10.1016/j.sleepx.2022.100042. PMID: 35169694; PMCID: PMC8829775.

5. Darraj A. The Link Between Sleeping and Type 2 Diabetes: A Systematic Review. Cureus. 2023 Nov 3;15(11):e48228. doi: 10.7759/cureus.48228. PMID: 38050514; PMCID: PMC10693913.

6. Covassin N, Singh P. Sleep Duration and Cardiovascular Disease Risk: Epidemiologic and Experimental Evidence. Sleep Med Clin. 2016 Mar;11(1):81-9. doi: 10.1016/j.jsmc.2015.10.007. Epub 2016 Jan 9. PMID: 26972035; PMCID: PMC4791534.

7. Fryar CD, Kit B, Carroll MD, Afful J. Hypertension prevalence, awareness, treatment, and control among adults age 18 and older: United States, August 2021–August 2023. NCHS Data Brief, no 511. Hyattsville, MD: National Center for Health Statistics. 2024. DOI:https://dx.doi.org/10.15620/cdc/164016

8. Faria A, Macedo A, Castro C, Valle E, Lacerda R, Ayas N, Laher I. Impact of sleep apnea and treatments on cardiovascular disease. Sleep Sci. 2022 Apr-Jun;15(2):250-258. doi: 10.5935/1984-0063.20220047. PMID: 35755909; PMCID: PMC9210566.

9. Henning RJ, Anderson WM. Sleep apnea is a common and dangerous cardiovascular risk factor. Curr Probl Cardiol. 2025 Jan;50(1):102838. doi: 10.1016/j.cpcardiol.2024.102838. Epub 2024 Sep 4. PMID: 39242062.

10. Dean, Y. E., Shebl, M. A., Rouzan, S. S., Bamousa, B. A. A., Talat, N. E., Ansari, S. A., Tanas, Y., & Aslam, M. (2023). Association between insomnia and the incidence of myocardial infarction: A systematic review and meta-analysis. Clinical Cardiology, 46(4), 376–385. https://doi.org/10.1002/clc.23984

11. King CR, Knutson KL, Rathouz PJ, Sidney S, Liu K, Lauderdale DS. Short sleep duration and incident coronary artery calcification. JAMA. 2008 Dec 24;300(24):2859-66. doi: 10.1001/jama.2008.867. PMID: 19109114; PMCID: PMC2661105.