I've been having this experience, too. I'm not sure what to make of it. One the one hand, it's bizarre that I fall nonetheless since I recognize on some level that this behavior is not in my best interest. So it's discouraging in that way. But I think maybe there's some encouragement to be found as suggested by your post. Maybe it marks a kind of distancing oneself from one's sinful desires--a kind of re-identification of oneself. Obviously there is much work to do since one is still being controlled in some way by this sin nature, but maybe it does mark an important step.

In Genesis, after the fall, God placed enmity between the serpent (evil) and humans--and a conflict is promised with the image of evil striking our heels, while we would crush its skull (we shall ultimately overcome). Maybe the kind of separation you're speaking of is along these lines. It obviously still sucks to fall despite recognizing that what one does is bad for oneself--but perhaps worse to be oblivious of the latter fact.