The Phantom Tollbooth by Norton Juster
OK, so this is not exactly a procrastination book lol. It is a children's fable, recommended for 9-12 year olds, so perfect for my level of maturity. If you've never read it, or even if you read it as a child, I highly recommend it. It's quite entertaining and thought provoking. 10-year Milo goes on a quest to save the Princesses Rhyme and Reason. On the way he is distracted by all kinds of monsters, of which these are my favorites:
The Terrible Trivium, demon of petty tasks and worthless jobs, ogre of wasted effort, and monster of habit.
The Horrible Hopping Hindsight, a most unpleasant fellow whose eyes were in the rear and whose rear was out in front.