Definately Ticking...not clicking...I know of a guy, a big burly biker who with his wife heard ticking somewhere on the lounge wall. It drove him mad as he could not source where exactly it was coming from...he ended up ripping all the jib rock off back to the wall framing...he thought perhaps it was dust mites
He repaired wall and again it started
I spoke to him about it and he refused to believe it could be something of a energy/spiritual/dimensional communication.
This is a sound, sound is a frequency vibration, it is generated from some form of energy...
Again when I approched the sound it stops...it seems when I enter the energy feild it is aware of my presence and stops. I back away and it starts again...
I have had it wake me up...right next to my ear...really loud...that was kinda freaky. I yelled stop and it did...then it started again...