How long is your brain alive after your heart stops beating and can you hear what is said at that time? My brother completed suicide April 5th this year by stabbing himself in the heart 2x. The doctors could not repair his heart therefore he was declared deceased BUT when the doctor came in to tell us they could not repair the heart, he then said his brain would still be alive for a couple of hours and that he could still hear what we were saying to him at that time. So we all went into the room at the hospital where he was and said our goodbyes. I m wondering if this is true about the brain and his being able to hear us? Has anyone heard of this before?