Once again, I'll mention Flylady.com. She's insisted for many years that you do chores for 15 minutes at a time and NO LONGER. When the alarm rings, STOP and go on to something else for 15 minutes, then when that is over, you can go back to whatever you want. For another 15 minutes.
This works for me when I have a lot of work staring me in the face and I know darn well that I can't do all of it or even half of it in one day. But 15 minutes at a time does do it. This works so well that in the last couple of years lots of magazines have started claiming this as their own, since it does work.