At the beginning of the year I've started to log my work times in a little day planner. Of course, since I dont have any data from before I started doing this, I can't really say it with certainty but I definitely
feel like I'm accomplishing more. I find logging work time to be very motivating, but I can't exactly put my finger on as to why.
I did, however, try this sort of thing before, but always with some kind of software or script, and I never kept at it. It only began working when I started to manually make notes with pen and paper. (The day planer I use has preprinted lines for every half hour, so I usually simply draw the time, which makes it possible to quickly skim through the book and instantly get a feeling of how much I worked in a given week and where in the day that work was concentrated.)
I've more and more began to appreciate getting away from the computer and doing things by hand, using different materials, using pens, pencils and paper, sketching on a whiteboard, pacing around the room etc.