does this happen most in cold weather? We can hear the intercom of a plant a quarter of a mile away on cold nights and our ductwork amplifies the sounds further. A train used by this same plant sounds like it's right in our bedroom on really cold nights when it's sitting idling on the track down by that plant. At times we can even hear the "beep, beep, beep, beep..." of trucks backing up down there. A neighbor had a van that had this "beeping" for backing up feature which was very annoying whenever she came in late at night. Alot of vehicles have this feature now so beware of this. You could also have the beginnings of a hearing problem. I have epilepsy and at times I hear beeping or just a high pitched long beep which weakens in seconds to nothing. This indicates a seizure is occurring. Try audio recordings to be sure it's not your hearing or another physical problem causing this. Crazy is a broad derrogatory term usually used by ignorant people to demean others. Doctors use it only to tell you that you aren't crazy. Past that I wouldn't assume there isn't an appliance behind this if you get an audio recording of it. I dug half the night one night to discover a long forgotten CO2 detector buried in a storage box in the basement. The batteries had been left in it. Hope this helps.

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