Some studies point to melatonin use as beneficial to heart health, while others say the opposite. Here’s how to make sense of ...

The secret to a healthier and "younger" heart lies in the vagus nerve. A recent study coordinated by the Sant'Anna School of ...

Heart attacks spike in the winter because the heart works harder to keep the body warm — and activities like shoveling snow ...

Background Despite anticoagulation, patients with atrial fibrillation (AF) experience persistent elevated cardiovascular risk ...

What makes someone a "morning lark" or a "night owl?" Why does jet lag hit us so hard, and why do some people struggle each ...