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I see you have allergies listed as a cause, and with allergies in the air in the northern Mountain West, I have to wonder if the sinus pressure contributes to the low humming sound.

For the past 6 months or so, I've thought that there might be a valve open or an eletrical issue in my walls. Most nights around 2-3 am, I would wake up with what sounded like a seashell or valve opening and closing. It is a low pitch drone that last from 10 seconds to 50 seconds, stops sharply...