WASHINGTON (AP) — Being a night owl can be bad for your heart. And that’s fixable, added Kianersi, who describes himself as “sort of a night owl” who feels a boost in “my analytical thinking” after about 7 or 8 at night. “It comes down to the problem of a night owl trying to live in a morning person’s world. That means it might be harder for a night owl to handle a high-calorie breakfast eaten very early in the day, during what normally would still be their biological night, Knutson said. But Kianersi said one of the best steps to protect heart health — for night owls and anyone — is to quit smoking.