I did this with When Stars Die. I had about seven chapters left to write in the draft and just decided to stop to get revising. But it worked. I got to revisions and was able to complete the entire thing. I had to concentrate more on the last chapters during a third read through, but, nonetheless, I got the book complete.
I can’t tell you why I do this. I can only guess. I assume I do this because I hate drafting. I get to a certain point where I’m tired of drafting and decide it’s time to get to the revisions, even though I have those final chapters roughly outlined. This seems counterproductive because how am I supposed to work on the ending if I don’t have it? Well, I do a detailed outline of it, and it does take me longer to write, but I’m more fired up about it because I have my mind trained to realize what I’m doing is revising since I love revising–even if it’s technically not.
I want to be fired up when I write, not disengaged and apathetic. So I do whatever I can to fire me up. If I have to quit a draft 7/10ths of the way through to do it, so be it.
But it works for me. I get it done.
Do you have any strange writing quirks, like writing out of order, starting a later scene first, things of that nature?