Today I sat down at 8PM, and set my timer for 15 minutes. I said, "Self, you only have to do this for 15 minutes. Then you can stop."
When the timer went off 15 minutes later, I turned it off. Two hours later, I hugged my stepdaughter goodnight. At some point, I did let a cat into the room to sleep under the halogen light. In between, I wrote.
At 10:30, I had almost 3000 words done, and blasted through a really hard chapter. The climax of the book is at hand, and the end is fast a-coming. (Again. This is the book that I got to 82,664 words, stopped, went back to about 60,000 words, and plunged forward again, plus reorganized the first four chapters. Today I'm at 83,484. Not only has the retrograde planet gone direct, it's past the point it went retrograde.)