Comment by hliyan

To me, procrastination is the brain overestimating (or perhaps just estimating) the unpleasantness of a task in the future. The unpleasantness could come from general lack of pleasure in performing the task, anticipation of frustration or irritation due to a gap in the skills or resources required, anxiety about not being able to successfully complete the task, or the output of the task not meeting one's personal expectations.

One example for me is getting out of the house: I loathe the idea of getting dressed, getting into the car and driving, whenever I contemplate it, but once I'm behind the wheel, the thought always is "this isn't so bad". If I think about the getting dressed bit, that too, thought of in isolation, isn't so bad. It seems it is the anticipation of a seemingly complex sequence of tasks that tend to put the brain off.