Desrtopa: Most of the time, I feel pretty much exactly the way you do. I've been told that I probably would've been diagnosed with ADD when I was younger if that had been something doctor's in my neck of the woods did then. The OP did strike a chord with me for those times when the deadline is approaching and I'm trying to get myself to start working and avoid overtime.

In my engineering work, I rarely am able to complete a single task in one day. My analysis or design projects generally require some trial-and-error, or reading up on a subject to, sort of, load the right software into my brain, etc. It's always so easy to stop doing that long-term, open-ended task and start doing some short-term, close-ended task like reading an article or a webcomic. I think, when I complete that article or whatever, I build up a reward cycle for that kind of action.