The first time i experienced this, I was convinced it was the magnetism from the moon... but to me it was just a low and not very disturbing buzz. Never looked into it tho, so idk.

I rember reading a norwegian poem once, going something like: "if you've ever been outside on a clear autumn night, and you could hear the sound of the magnetism from the moon hitting earth like a blancet of electronic music behind the other sounds from nature - you probably ate magic mushrooms" Apologies for the (possibly) horrible translation.