The title of this thread is also the title of a book, written by Ajahn Sumedho, an American Buddhist monk. It's also referred to as Nada Yoga, or 'the yoga of inner light and sound'. It's a noise that used to only be noticeable when my surroundings were quiet. It would sound like a high pitched buzzing, humming, electric static. Faint but noticeable. When I tried researching it online, most people said it was tinnitus. Even Ajahn Sumedho in his book says people think it's tinnitus. But this sound isn't bothersome, nor is it always noticeable, until I'm somewhere quiet, then it's clear as day. Although Ajahn Sumedho says he can now hear it even when external noises around him are loud. 

I've been using it as a meditation focus during 'Do Nothing Meditation' - I alternate between focusing on the noise and allowing my mind to wander. It's quite nice, I just focus on the sound, and it begins to get louder, until I'm absorbed in it.  I guess my question is - 1) who else notices this sound
2) does it have a deeper meaning
3) have you heard of anyone talk about this before


Thanks!