Until I was about ten years old i lived in a two story house, near the beach. the bottom story was just a large garage/storage space. and the top story of our house was where I lived with my family.
Every night I would settle into my bed which was a futon resting directly on the floor. when I would put my ear on the pillow I would hear a low hum, reverberating in my head like a large diesel ingine idling below my house. Every night I would hear this sound, though it never truly frightened me I remember it was always mysterious. especially because my parents were not able to her this low frequency hum that plagues my bedtime.
We moved out of the house in September 2001. when we returned to the home town where I had heard the hum as a child, I happened upon a yahoo news item. It was an article about several universal unexplainable phenomenons. One of the phenomenons was something called "the Taos Hum" or "the Hum". it is a low frequency sound that is heard by some people, it is unexplained and is a global mystery. I recognized that the Taos hum was what I had heard in my childhood. My mouth went dry.