
Being active late at night may affect heart health. A large study found night owls often have poorer cardiovascular outcomes compared with early risers.
The issue is tied to the circadian rhythm, our 24-hour internal clock. Misalignment with daily schedules can make healthy habits harder to maintain, including exercise, diet, and sleep.
Sina Kianersi is a research fellow at Brigham and Women’s Hospital. She explains, “The challenge is the mismatch between your internal clock and typical daily schedules.”

Heart disease remains the leading cause of death in the U.S. Aligning lifestyle habits with your natural rhythm can help protect your heart over time.
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