Sleep is an essential part of keeping your heart healthy. If you don’t sleep enough, you may be at a higher risk for cardiovascular disease. One study looking at 3,000 adults over the age of 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. Researchers believe sleeping too little causes disruptions in underlying health conditions and biological processes, including blood pressure and inflammation.