I have often heard married couples speak of their morning-after-the-wedding response of "Who is this other person in my bed?!?" Their love hasn't died, and neither has their commitment to the person, but somehow they are faced with reality in a whole new way after "their day" has come and gone.
I am currently experiencing very simliar feelings. NaNoWriMo, my 'commitment to my commitment' to you has not wavered, nor has my love for the process I'm sure this will be. But I feel a bit like a tentative newlywed; I'm not entirely sure what I've gotten myself into. It feels as though there is a stranger in my bed.
But you're cute, so you can stay there :)