Doctors who reach for that third coffee on overnights can rest easy they’re not upping their risk of atrial-fibrillation — for the men at least.

In fact, drinking up to three cups of coffee each day lowers men’s risk of AF, according to data from nearly 19,000 US physicians.

But there is no significant link between other dietary caffeine and one of the most common forms of arrhythmia, researchers from the Brigham and Women’s Hospital at Harvard Medical School report.

For the study, nearly 19,000 male doctors (mean age 66) involved in the Physicians’ Health Study provided dietary information, including their coffee and dietary caffeine consumption.