Welcome to HCM
We understand your concerns
I went through your problem desription. You re hearing a snap sound from your head almost everyday while retiring for sleep. Medically there may not be any satisfactory explanation for this. You must have seen such scenes in several psychological thrillers or films which deals with a person who has psychological prooblems.
My explanation for this problem goes like this - When you had stroke
8 months ago, you experienced snapping sound due to some internal medical condition. Remember stroke is associated mainly with brain. That episode etched the mark of the snap in your mind which you hear over and over at certain times. This happens due to minds fear and defence mechanism. You re successfully ignoring it and going to sleep. That is why this delusion
is not becoming problamatic. Very good going.
I advice to first consult a neurologist
and confirm there is nothing wrong and continue ignoring the snapping sound and it should disappear.
I hope I clarified your doubts. Available for further queries.