Okay, Okay...
My little contest induced some of you lurkers to come out and comment, for which I am happy. Others have been phoning each other and me with guesses (all wrong).
So. I'll tell you now what was making the noise that had my neighbour and the police in a such twist - it was the dying battery of a pager. Said pager was lying on top of the refrigerator which is situated under a cupboard. The cupboard is under a stairway. Go figure.
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Very pretty blanket.