Procrastination is a battle between the present and future self. What you are now, is different from the person you are a year after, tomorrow, or even the person you are a few minutes later.
The trick is to accept the now you will not be the person facing those choices, it will be the future you – a person who can’t be trusted. Future-you will give in, and then you’ll go back to being now-you and feel weak and ashamed. Now-you must trick future-you into doing what is right for both parties.
(http://youarenotsosmart.com/2010/10/27/procrastination/)
To put it in another way, doing your work now is like doing your future self a favor. In time, when your future self becomes the present, you’ll have a reason to thank your past self.