What is the sound of a heartbeat?

So we play mental gymnastics. We use words as hoops. We do a little dance, cartwheel through the air.

And still, my heart aches. Every night, I lay awake and listen to the beating of my heart and I wonder what does it take to stop it forever?

Every night, my heart beats and I can feel the sound of it in my ears, like a crashing wave, wave after wave after wave.