This year the chief joy of my Christmas break from work, apart from Christmas itself, is that I can get up first thing in the morning, before anyone else is up, and work on Very Truly Run After. That's the best time of day for writing, for me, especially if I know the night before that that's what I'm going to do. My subconscious gets to chew on the story all night, and in the morning I make coffee, say Morning Prayer, and get to work. And because I'm not going into the office, I have both the time and energy to make something of it. I'm now at about 87.5K words and heading into the last act.
So, here's to hoping that your Christmas break is as pleasant and creative as mine!