Perplexity

Perplexity: (n)  A unit of time.  The interval between the moment of incredulous surprise when your own code doesn't work immediately first time, and the "d'uh" moment sometime later.  Perplexity can involve formal debugging, wild guesses, accuations, paranoia, staring into space, and considerably more than 43 beans, but it is almost certainly inversely proportional to the amount of sleep had the night before. 

In the end, problem solving is about letting go of the problem, Creating space for answers unbidden. Ah, the sweet epiphany of "Got It!"