You’ve made progress on your novel. You’re on your second draft and past the halfway point. You can’t believe it. Once you’re done with this, the novel will need work, edits, polish, maybe even one more rewrite.
The second draft is coherent in a way that the rough draft was not. The rough draft was a mess. Once you have finished the second draft, you have finally finished a book - a novel that needs work, but still a book.
Then your monkey mind starts swinging through the trees and your ADD goes off the chain. You can’t focus.