The last 2 hours before a deadline are the worst. It starts seeming possible that I'm not going to make the deadline and so the panic sets in and so I become less and less able to concentrate on the task at hand. And so I start sending random acquaintances links to pictures of baby sloths and blogging compulsively and seeking out sounding boards around campus.
Once more to the breach!
(and searching online to remind myself of the precise wording of Shakespearean idioms)