Question

Your heart beat usually _________ when you are asleep
A. Does not change
B. Speeds up
C. Slows down
D. Stops

Answer 1

C.slows down beacuse enough are not doing anything so your heart slows down

Answer 2

I would say C, slows down.
I say that because while sleeping, your brain AND body are asleep, so everything in your body is relaxing, Including your heart.
Hope this helps :)