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I recently noticed that when I'm lying down quietly, my heart rate speeds up and slows down. Should I be alarmed?
This speeding up and slowing of the heart rate at rest is called heart rate variability. It is very normal. If you observe more closely, you will probably find that it is related to your breathing. As you inhale, your heart rate goes up; as you exhale, it goes down. It is pretty subtle, which is why many people don't notice it.
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