Not disagreeing with the original point, but will offer another possibility: If you aren't well, it's easy to zone out in front of the computer. I have done lots and lots of this while very sick. I do less of it now that I am healthier. (If you are smart and not really well, the internet is a good way to get some of the mental stimulation you crave when you are too out of it to go get more of a life.) And if your keyboard is not clean enough, this can sap your energy. I wipe my keyboard down when I first get to work and we wipe our keyboards down repeatedly at home before someone gets on it. For me, this makes a difference in ability to focus and not simply zone out. Getting rid of an older, dirtier computer and getting a brand new one also has meant that I spend a lot less time mindlessly piddling on the internet.
Ow. That hurt. (But thanks, I'll definitely use that quote in the future!)