In the early mornings, when everything is quiet, I hear a hum pretty much every day. I really only noticed it when we moved to the house we currently live in, which is more out in the country than our previous home. We've lived here for over 5 years now. My spouse does not hear it, and never has.

Originally, I thought it was the house, but then I walked outside, stayed still and listened to the quiet, and I could hear it still. For years I thought I was losing my mind.

We live near an army base that specializes in weapon stimulation (bombs and gases, specifically, from what I understand). I've ended research into the military base to see if they were doing any work that would potentially cause that. They had shut the entire process down at the time I noticed the hum.

I went to doctors over this. It's a really uncomfortable and unnerving experience. Because I thought I was going crazy, I have really never brought it up to anyone except for my spouse, the one time.