Verbmall has an interesting creation on the opposite of epiphany:

So, let me approach the question from an etymological perspective. An epiphany leads a person to a burst of internal light. We need a term to metaphorically express leading a person to a dark cave. Let’s save the epi-, meaning to, and let’s add the combining form -calyptry, from the Greek kalyptra, covered and hidden as by a veil.

 

Thus, we have epicalyptry [ep´-ee-cal-ip´-tree], deliberate concealment from self or resistance to insight. Spread the word, folks. Let’s get it into dictionaries.

While Urban Dictionary plumps for depiphany:

depiphany

an epiphany that has been forgotten.

 

"I just had the most brilliant idea ever!"

 

"What?"

 

"I forget."

 

"You had another depiphany?"

Although that's not exactly your interpretation.

Verbmall has an interesting creation on the opposite of epiphany:

So, let me approach the question from an etymological perspective. An epiphany leads a person to a burst of internal light. We need a term to metaphorically express leading a person to a dark cave. Let’s save the epi-, meaning to, and let’s add the combining form -calyptry, from the Greek kalyptra, covered and hidden as by a veil.

Thus, we have epicalyptry [ep´-ee-cal-ip´-tree], deliberate concealment from self or resistance to insight. Spread the word, folks. Let’s get it into dictionaries.

While Urban Dictionary plumps for depiphany:

depiphany

an epiphany that has been forgotten.

"I just had the most brilliant idea ever!"

"What?"

"I forget."

"You had another depiphany?"

Although that's not exactly your interpretation.