What is the force or process that hides, obscures or removes dream signs, and recognizing them?

Does anyone have any idea what this energy, force or process is that interferes with your ability to become aware that you are dreaming?

For example, when I started lucid dreaming, the muppets were always in my dreams. Don't ask me why, I have no idea. I used them for a Dream Sign, but now I no longer see them, or if I am seeing them I no longer remember. I think it more likely that they just stopped appearing. I would use the old house I used to live in, a double-wide trailer. I am always going back to that place. It has not been taken away, but instead is usually hidden, masked or obscured in some way. I used to see the field behind that house - I no longer see it. Last night I saw my hands in my dream, but they were odd, super clean, almost luminous, as if I had scrubbed them. I was distracted by their odd appearance and as a result could not use them to tell myself I am dreaming.

I hesitate to say something is blocking me or preventing me. Trying to avoid negative focus. I do not want to reinforce something unwanted, or create it. So for now I am just saying that it feels like something may be preventing me from becoming lucid by hiding, masking, obscuring or in some cases removing Dream Signs. I would like to know what this is, what to call it. I want to put a name to it. The reason is because I am going to use self-hypnosis to power it off, shut it down or remove it. This is what I have written for my suggestion:

As I dream, I am free from any inference with my awareness that I am dreaming.

This is sort of like an affirmation. It has to be a positive, not a negative focus. It's not, "I am fat and I want to loose weight" this focuses on the negative, unwanted aspect, and wanting something only gives you more want. So you have to say, "I am free to make healthy eating choices and do the exercises I enjoy." So if you think I need to phrase this differently, please keep that in mind with your suggestions.

I truly believe we can program ourselves to do anything - anything at all. That includes programming ourselves to be always conscious and lucid in our dreams, should we want that, That is what I am working towards in my self hypnosis scripts. To my mind something programmed me to be this way, to have these issues with Dream Signs. Maybe a doubt or fear. Maybe scraps of my former faith or childhood experiences. I am deleting that bad code and inserting brand new code that accomplishes what I want. So I appreciate your help figuring this out.

Thank you!