I too am writing several novels at once. They say you either have a quick novel, or a slow burner which grows as a story. I seem to be only able to write slowly.
I heard a great snippet from an interview with Sophie Kinsella (Shopaholic books), she said; "human beings are apathetic, and will do the least they have to in any given situation." Some marvellous teacher told her that when she attended a screenwriting course.
Yep, it's what I want to do, but the house will be immaculately tidy before I write the next chapter. Anyone like that?