Slightly OT (but not by much): I have read somewhere that one secret to write more is to stop in the middle of something -- if fiction, in the middle of a scene, if non-fiction, in the middle of a demonstration or exposition for example.
The rationale is that the brain 1/ hates starting new things and 2/ loves finishing. So if you stop in the middle, you will absolutely want to finish the next day, whereas if you finish, you will not want to start a new scene and you may postpone going back to work indefinitely.
Now for the disclaimer, I have tried this but never actually succeeded, and in effect I'm stuck in the finish/hard to start again mode. I'm also afraid I won't remember what I was trying to say, but the main problem is the desire to finish proves too hard to resist. YMMV.