By procrastinating, you are depriving yourself of the pleasure and satisfaction of getting something accomplished. It could be a small pleasure, like that of having a clean stove top, or a very significant one, like publishing an article.
So procrastination is a way of punishing yourself. You do not deserve such satisfactions, in your mind.
The pleasures of dolce far niente are also real ones, but can they be fully enjoyed when tinged with the askesis of procrastination?