Around 4-5 years ago, when I lived in Ojai, CA, a recurring event took place for several nights, to several weeks on end. I was hearing a strange
frequency that would give me goosebumps, and actually make my eyes heavy and watery. I would feel nauseated sometimes and not hear anything, but sure
enough, later on in the night, I would hear this noise again, and it would keep me up all night.
This sound is of extreme low frequency, a constant hum, if you will, as the official name of this phenomenon, the Taos Hum. I eventually noticed that
every night when I would hear this noise, birds would be chirping as if it was in the middle of the day, when quiet nights, there would be silence,
Some nights, I would hear it, and it would resemble a distant loud truck, possibly a diesel, rumbling while at an idle, for hours. I drove around a
few nights when I heard this, and could never find any source.
So I looked it up online, and researched it. It turns out, thousands of people across the country have witnessed this and are curious about it. Check
out all of these reports... Taos Hum Reports
There are other links there if you are more interested in it.
I think it might have something to do with the military, perhaps on Catalina Island, or Vandenberg. If not, possibly something electro magnetic, or ??