My elderly dm lives on her own and sleeps downstairs on the sofa.
She says it doesn't happen every night but she has been experiencing a sound of 3 knocks like somebody is at the door it's at random times but always during the night.
It's always 3 knocks as well and she is too scared to actually get up and look out of the window.
What could this be I am so tempted to stay there on the odd night to see if I hear anything.