Have you ever had a good night's sleep, then awakened to a new understanding of your story and how certain things should move or how certain characters should act? Like, suddenly it's clear as day, after a few months of struggling with everything?
Yeah, it's really cool. Yesterday I woke up from a dream which I don't remember now, but I had a clear mental picture of how to "fix" my story. Something I couldn't see for months, but is now so obvious. And not just one plot element, but multiple. I'm not sure if they are epiphanies, but they sure unclog the drain. :)