Body Atlas

Healthy Heart Habits · Heart

How does sleep affect the heart?

The heart's night shift and the alarm system that shouldn't stay on.

The simple answer

While you're deep asleep, your heart rate and blood pressure drop — a nightly rest for your whole circulatory system. Most adults need about 7 to 9 hours; regularly getting much less is linked in research with higher blood pressure and higher heart risk.

Go deeper

There's more: the heart's night shift and the alarm system that shouldn't stay on. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

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