Started getting heart beat sounds in right ear only. Got an MRA to check the arteries (no results yet). Strangely the sounds start in the evening and continue when I go to bed. I have no idea why it's quiet during the day. Has anyone else had this experience. If my arteries are okay in my brain then I have to look for other causes. Any ideas. I checked medication side effects but that doesn't seem to be the cause. One night I exercised in the evening and I had no sounds, but that didn't work yesterday. I'm perplexed.