Mine was the sound of ocean waves. I used to play rain and ocean waves to get my kids to fall asleep. To my surprise, I turned off the sound when they fell asle

Mine was the sound of ocean waves. I used to play rain and ocean waves to get my kids to fall asleep. To my surprise, I turned off the sound when they fell asleep but the waves were still crashing on the shore. I assumed the neighbors were playing it for their children as well. The same thing the next day, I thought the neighbors had just left their noise machine on all day. At night it became louder and I went outside to check if I was the only one bothered by the noise. I finally asked my wife, she said she hadn't noticed it. Thought she was going deaf. It was starting to really bother me, it was as if they had dialed the sound to 11. I went outside, and surprisingly I saw a neighbor looking out as well. I went back in, plugged my earphones and played an audiobook. Unfortunately I chose a Lord of the rings rendition with sound effects. I got up in the middle of the night, and noticed that the sound was just as loud in the bathroom as in the bedroom. Kitchen and living room, all the same. Whether I covered my ears or not, it all sounded just the same. I laughed to myself. I still spent several weeks of sleepless nights until it went away on it's own. What a terrible experience it was.