As if you needed any more reason to skip out of work early from time to time, new research has revealed that working long hours can actually put your heart in danger.

A study published in the European Heart Journal found that working too much can up your chances of atrial fibrillation, also known as an irregular heartbeat.

Researchers surveyed more than 85,000 working adults, and discovered that those who worked 55 or more hours per week were 42 percent more likely to get atrial fibrillation during the decade-long follow up than those who worked between 35 and 40 hours a week.

Moreover, nine out of every 10 atrial fibrillation cases occurred in people without pre-existing heart diseases, the researchers write, meaning long work hours are likely to blame for the extra risk of the condition.

Atrial fibrillation can lead to stroke or heart failure if not addressed. While some sufferers don’t experience any symptoms, those who do often report heart palpitations, weakness, fatigue, lightheadedness, or shortness of breath.

The researchers say long work hours may mess with your automatic nervous system, heightening your risk of atrial fibrillation. It’s also possible that those who work long hours have more conventional risk factors for atrial fibrillation, including obesity, smoking, physical inactivity, and higher alcohol use.

All this to say: maybe consider calling it quits early today.

h/t Men’s Health