Is the supernatural trying to communicate with me?

quick reply that fits with standards... Call a plumber!

Set up a recording device, then play the knocking for some one else. If they hear it too, then you are not hallucinating. ( you might even get an EVP to go with the knocking.....try 'asking' if there is someone/ thing trying to communicate, and leave the recorder going as long as possible.)

Perhaps another person might hear a pattern, a signal.......it could even be in morse code.

Im just doing this to get it back into myATS b/c it got
deleted.