I get it all the time. The scientific explanation is that it has been shown to be reproducable under lab conditions by using low frequency sound waves (so low you can't hear them). Quite a lot of modern "haunted" buildings, are "haunted" by their air con units producing this sound. Saw a documentary on it once.
I notice it all the time and read nothing into it so i'm probably no help. I find it happens more when i'm sleep deprived.
Bx


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