This Harvard-affiliated study on night owls reveals surprising heart health findings

Being a night owl can be bad for your heart.

That may sound surprising but a large study found people who are more active late at night — when most of the population is winding down or already asleep — have poorer overall heart health than the average person.

“It is not like, that, night owls are doomed,” said research fellow Sina Kianersi of Brigham and Women’s Hospital and Harvard Medical School, who led the study. “The challenge is the mismatch between your internal clock and...