So for the past week or so I've heard this continuous (24/7), very subtle (but very annoying when trying to sleep) high-pitched noise in my apartment. I can hear it best in my bedroom (by a window) and my bathroom (towards the inside of my building). I live above, below, and next to others. I tried shutting off all the breakers and it was still there. It sounds like an electrical buzz or perhaps a distant generator or engine. I can't really hear it outside, but that could be due to all the distracting noises. I know it's a long shot, but any ideas? Any tricks for learning to love annoying noises? Download the sound here. I can hear it with my headphones turned all the way up, though there's some background noise too.