I had a late night revelation a few nights ago (as opposed to a late night revelation which I could have had in the afternoon) and am now playing with changing certain plots - which will necessitate changing other plots, which could lead to a whole bunch of re-writing.
The bigger question is: When is enough enough? How do you know that the book is where it should be and to just leave the damn thing alone? If a large siren would sound it would be better. Or a loud deep voice warning me to 'step away from the computer'.
Ah well. Perhaps I'll work on something else and come back for a 'sober second look' later.