I don't really have much to say today--at least not about writing and not that I want to write about right now. I've been doing some writing of my own today, trying to get another project moving, so I'm a little written-out.
But it's always a good dictum to try to spend a little time with a project each day, even if you're busy with other things. A little time on a day that you can't do much is still some time to let your imagination roam over the possibilities, and perhaps to create some new ones.
A little bit of time is good to try to think about a problem from a new angle, or maybe to consider what you're going to do next. Working on your dissertation every keeps your mind working on the problem, even if you're not consciously working on the problem.
Imagine the time as a little bit of exercise for just that portion of your brain dedicated to the dissertation. You notice the actual work you do, but your body responds to the work by growing. Your muscles don't grow when you lift weights. But if you lift weights, your muscles do grow. Working on your dissertation is like lifting mental weights (in this limited sense).
If you're willing to do just a little work to stay in touch with the project, that helps you move to the days when you do more work. It also helps you see that you can make progress in small increments. It also helps stave off the sense that there is a tremendous mass of work waiting to be done.