A study of more than 320,000 people found that night owls are more likely to engage in behaviors that increase the risk of cardiovascular disease such as smoking and sleeping poorlyLike staying up late? You may be putting yourself at risk of heart problemsStaying up late to binge a favorite TV show or go out with friends can be one of life’s simple pleasures. But being a habitual night owl—especially if you are a woman—may be putting your heart at risk, new research suggests. The study was partially funded by the American Heart Association (AHA) and published on Wednesday in the Journal of the American Heart Association. “These findings show that the higher heart disease risks among evening types are partly due to modifiable behaviors such as smoking and sleep,” she said.