I submitted early Feb and I feel the same way. I actually resubmitted once or twice to change how far we had gotten (lines of code) and new competitors that cropped up (note: more than you'd think in such a short period of time).

Oddly, what is keeping me awake isn't the application so much. I've kind of resigned myself that it would be a nice-to-have but not a requirement. What keeps me awake now is things like reducing my monthly expenses more and more so I can work less and less for the man and more and more for myself.

I think this is the key, my main reason for applying to YC was to be able to work on my product full time. That is my only goal right now, but mortgage, kid etc make it hard.