Getting to the 'heart' of sleep

February 5, 2016 by From Mayo Clinic News Network, Mayo Clinic News Network
Credit: Vera Kratochvil/public domain

Sleep is essential for a healthy heart. People who don't sleep enough are at higher risk for heart disease. One study that examined data from 3,000 adults over age 45 found that those who slept fewer than six hours per night were about twice as likely to have a stroke or heart attack as people who slept six to eight hours per night. Sleep deprivation is a growing problem, with 28 percent of adults now reporting that they get six or fewer hours of sleep per night.

It's not clear why less is detrimental to , but researchers understand that sleeping too little causes disruptions in many normal functions of the body, including and blood pressure.

"Lack of sleep also is a 'weighty' issue. In a 2012 study I conducted, 17 people ages 18 to 40 spent 15 days in our research lab and were allowed to eat as much as they wanted. Half the group was only allowed to sleep two-thirds of their normal sleep time; the other half served as controls and were allowed the full amount," says Mayo Clinic Health System cardiologist Andrew Calvin. "We found that the test group ate an average of 559 additional calories each day. More importantly, it didn't seem that the people who were awake longer burned more calories from additional activities. Our study concluded that if that rate of consumption kept going, the people who slept less could gain up to one pound a week."

"Furthermore, those in the study who slept less had signs that their blood vessels didn't work as well, something called . Endothelial dysfunction is found in people at risk for attacks, so this is a worrisome finding that should be explored further," adds Dr. Calvin.

Another condition that can affect heart health is sleep apnea, a condition that causes people to wake frequently throughout the night. This disrupted sleep can lead to higher at night and during the day, and may increase the risk for heart attacks and stroke. One study found that over an eight-year period, men with severe sleep apnea were 58 percent more likely to develop than men without the nighttime breathing disorder. But it doesn't take a severe underlying sleep disorder to see effects on the heart. Poor sleeping, as a result of changing work schedules or poor sleep habits, for example, can put you at risk as well.

"Don't compromise your heart health," says Dr. Calvin. "Do your best to make quality sleep a priority in your life. This isn't being lazy; it's good wisdom. The National Sleep Foundation recommends that adults get seven to nine hours of sleep a ."

February is Heart Awareness Month.

Explore further: Prolonged shortened sleep increases blood pressure at night

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