[Verbmall][1] 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.


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While [Urban Dictionary][2] 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.


  [1]: http://verbmall.blogspot.ie/2008/10/epiphany-and-epicalyptry.html
  [2]: http://www.urbandictionary.com/define.php?term=depiphany