Why does your heart beat slow when you sleep?

Answer 1

When you become active, you need more of oxygen and nutrition for muscle cells. So heart pumps more blood to meet the requirement.

Answer 2

It beats slower because it does not need to get blood to other parts of the body as fast as if you were working out

Answer 3

Because you aren't active in your sleep therefore the heart doesn't have to work as hard. When you're sleep it's called the nocturnal dip. I believe your heart rate dips about 10%.

Answer 4

because your not getting enough oxyen so it works harder to try to get more oxygen

Answer 5

Because you are having some rest