I do have a fairly regular routine. Because my brain seems to function the most efficiently in the morning, I’m usually at my desk by 7am. I remain here until noon and return at 1pm for another one to two hours. By 3pm my writing is beginning to get sloppy. Any work done after 3 is usually deleted or dramatically revised the following morning. So I often call it a day by mid-afternoon. Most of my evenings are filled with reading, either research or pleasure, though even pleasure reading usually has an element of research in it.
The cat on my lap believes he is my muse and is never far from me while I work.