<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have had two open heart surgeries, since the first one, when I lay down I hear my heart beat so loud in my ear that I can go to sleep without taking something. will this eventually quit and why is it doing it? this has been going on for 18 months.  <response>: Hello, In most probability you had any of your heart valve replaced with a metallic one. What you are hearing is the click of that valve. Generally a patient gets used to such sound. You just need to know thats its a normal phenomenon and there is nothing wrong with your heart or you. If its very disturbing you may try a small dose of tranquilizer only after consulting your doctor. Hoping I could help. Regards Chat Doctor. 