I have this habit when I write. Just to keep myself honest, I start every day by writing down the current word count. The goal is to add 1,000 more before knocking off for the day. That's about three double-spaced pages.
I tiptoe into the manuscript, cleaning up the previous day's work to remind me where I left off. Hemingway was a big fan of not thinking about a project between the end of one day and beginning of the next, believing the subconscious would sort out any issues.
I believe this to be true.