When I started working long hours in front of a computer,alone, I had to stop doing it. It was impossible to continue after some time doing that.
I though it was procrastination. Then I learn about the lymphatic system and how the body needs to move every single day or else you will feel miserable.
So I started doing exercise every day and suddenly I could work for long hours. There was something wrong and the body acted like a baby that does not know what is wrong but knows something is wrong and cries.
Any procrastination technique that does not consider the root of the problem will fail.
I also put my computer in front of my eyes while standing up, added physical objects to my work, devices that react to touch(3d mouses) or movement.... and my live improved enormously. The reason they work is even longer and more complex that the lymphatic system.
Another very useful thing was recording in a piece of paper the time(hours of real work) and intensity of my work(in a color scale). I realized I called "procastination" when I tried to do too much work (8 hours a day) of work that at the end of the day was super intensive.
It was kind of ridiculous. It is like considering that because you could walk for 8 hours that you could run a marathon with the same velocity and intensity as a sprints. And then do it every single day after that.
Being young, I could do one day(or two) this way, but after that I did burn out.
Computers are very antinatural objects for human beings. If you try to adapt yourself to the computer instead of the other way around,(making the computer speak for example) you are going to suffer enormously.