Procrastination: The science behind why we do it and how to stop!

It's all about temporal discounting: Imminent rewards seem way more valuable to the primitive reward centers in our brains.  The solution: reward yourself in small intervals & set deadlines.  You wouldn't make your puppy wait until the end of the training session to get his treat, and you shouldn't make yourself wait either.
This video has some other great tips, too!