I leave the house at 7:30 am for work, 6 am on gym days, so by 6:30 or 7 pm when I sit down to write, I'm pretty tired out. For me, that's the hardest part of writing a book- fatigue of my body and my mind.
I am lucky enough to have a job that gives me some time off scattered through the year, and I do get about 10 days off for the Christmas/New Years holidays. I was able to use a few days of that vacation to actually plan the rest of my book and get some new writing done. I sat down and reread the last 75 pages or so of my book (I actually liked most of it) and that helped put me back in the mindset I needed to flesh out the rest of the story. I jotted down about ten scenes that need to take place before Sophie's story is finished and then I put them in a logical order. I wrote a first draft of three of them during vacation.
Now that I have the end in sight and basically plotted out, I can (hopefully) finish my first draft in the next few weeks. Wish me luck!