At times I put things off until the deadline is looming, even with my professional writing. I think this has to do with the adrenaline and drive that pending potential failure offers. I also like to percolate my ideas as long as possible before I put them on paper (or in pixels, as is the case.)
Sometimes this results in better work, fed by the thrill of accomplishment. Other times it overwhelms me and I almost fall apart. Then I remind myself that I am too old for this, drink a nice hot coffee and get to writing.