Make the most of the time you have to write by using your pre-writing downtime wisely. Are there character backstories that need fleshing out? Plot points that aren’t fully formed in your mind? In between your writing sessions, make a list of the details in your story that need attention. Then, when you find yourself commuting, walking the dog or folding laundry, work through the list in your head. By the time you’re ready to sit down to write, you’ll have the details fresh in your mind to get them onto the page.