Never finish a writing session by finishing off a scene.
Even if you’re in the grip of the muse and the words are flowing . . . stop before you finish. If you can bring yourself to do it, stop in the middle of a sentence. . . . You’ll find that you’re keen to get back to the page when your next day’s writing session begins. Moreover, you won’t be stuck at the beginning of a new scene, staring at the flashing Cursor of Doom and wondering what happens next. You’ll always have something to pick up and run with.
Or, as someone put it to me, always leave yourself somewhere to go next time.