The 7 Keys to Sleep Health—And Why Missing Just One Could Hurt Your Heart

DALLAS — Your inconsistent sleep schedule might be a ticking time bomb for your heart. While most of us obsess over getting enough hours, new research from the American Heart Association reveals that irregular bedtimes, night-to-night sleep variability, and even afternoon napping dramatically increase cardiovascular risks, regardless of your total sleep duration.

A new scientific statement released by the American Heart Association (AHA) introduces a revolutionary concept called “multidimensional sleep health” that goes far beyond the simple recommendation to get seven to nine hours of shut-eye. The statement, published in the journal Circulation: Cardiovascular Quality and Outcomes, argues that sleep is far more complex than just duration and that multiple aspects of how we sleep affect our heart health.

Poor sleep has become a widespread issue, with experts noting that a majority of American adults experience some form of sleep difficulty. While the AHA added sleep duration to its “Life’s Essential 8” metrics of cardiovascular health in 2022, this new statement makes the case that we’ve been missing the bigger picture.

The Seven Dimensions of Sleep Health

What exactly makes up “multidimensional sleep health”? According to the researchers, it includes seven key dimensions:

1. Sleep duration
2. Continuity (how well you stay asleep)
3. Timing (when you sleep)
4. Regularity (consistency of sleep patterns)
5. Daytime functioning
6. Sleep architecture (sleep stages)
7. Absence of sleep disorders

Each of these aspects independently influences heart health risks. For instance, research shows that going to bed after midnight increases the odds of obesity by 20% and raises the risk of heart attack by 63% compared to earlier bedtimes. Even if you’re getting your full seven hours, an irregular sleep schedule, varying by more than an hour from day to day, is associated with a 33% higher risk of coronary artery calcium buildup, a marker for heart disease.

“Most adults need 7 to 9 hours of sleep each night, and suboptimal sleep raises the risk for cardiovascular disease, along with risk of cognitive decline, depression, obesity, as well as high blood pressure, blood sugar and cholesterol levels,” says study author Marie-Pierre St-Onge from Columbia University, in a statement. “However, there is increasing evidence that sleep health is about more than the number of hours you sleep each night.”

While many people use daytime naps to compensate for poor nighttime sleep, research shows this strategy can backfire. A meta-analysis cited in the statement found that daytime napping is associated with higher rates of obesity, type 2 diabetes, high cholesterol, metabolic syndrome, cardiovascular disease, and even higher mortality rates. However, short naps under 30 minutes don’t appear to carry these risks for adults under 60.

A Warning Sign for Heart Disease

For those who struggle with daytime sleepiness, research shows this has been linked to a 28% higher risk of cardiovascular disease, a 28% higher risk of coronary heart disease, and a 52% higher risk of stroke. What makes this more complex is the bidirectional relationship, meaning heart disease risk factors like obesity can cause sleepiness, and sleepiness can contribute to developing these same risk factors.

Rather than just asking, “How many hours do you sleep?” physicians should evaluate multiple dimensions of sleep quality and patterns. St-Onge recommends that healthcare professionals ask patients specific questions about their sleep habits: “How long does it typically take you to fall asleep each night?” “How many times do you wake up during the night?” and “How often do you feel exhausted during the day?” These questions can give patients the opportunity to share concerns about their sleep experience.

“Some changes in sleep across the life course are natural, however, individuals should not accept poor or worsening sleep as a ‘fact of life’ or unavoidable consequence of the aging process,” adds St-Onge. “If they note new difficulties falling or staying asleep, or excessive daytime sleepiness, they should discuss this with their doctor for further evaluation and potential treatment.”

How Race and Socioeconomic Factors Impact Rest

Sleep health isn’t equitable across populations. People from historically underrepresented racial or ethnic groups often experience poorer sleep health across multiple dimensions compared to their non-Hispanic White counterparts. These disparities persist throughout life and are influenced by social determinants like neighborhood characteristics, socioeconomic status, and discrimination.

Higher education and professional occupations, typically associated with better health outcomes, sometimes correlate with worse sleep health for Black and Hispanic individuals, while the opposite is true for White individuals.

A recent review of more than 300 studies found consistent associations between lower socioeconomic status and suboptimal sleep health. Where you live may determine your sleep quality based on factors like light, air, and noise pollution and safety.

While there are numerous smartwatches and other personal devices available to track the amount of time spent asleep per night, advances in ways to assess other sleep dimensions are needed. The experts stress that additional research is necessary to better understand how to properly assess these sleep dimensions and develop effective interventions for various healthcare settings.

Poor sleep isn’t just about feeling tired; it can potentially endanger your heart. Incorporating these various sleep measures into cardiovascular risk assessments could help identify at-risk individuals before they develop heart problems, saving lives through better sleep awareness. Your consistent sleep schedule might be just as important as those eight hours you’re trying to log each night.