Here's a great article on why writers procrastinate from The Atlantic.
http://m.theatlantic.com/business/archive/2014/02/the-psychological-roots-of-procrastination/283773/#ad-jump-ad-mobile-instream-1
http://m.theatlantic.com/business/archive/2014/02/the-psychological-roots-of-procrastination/283773/#ad-jump-ad-mobile-instream-1