The secret is to just get 'started'.
Just like how a video game or Facebook is addictive. It is physiologically compulsive to have people want to 'finish' what they start. But media is super quick so we achieve this 'high' whenever we 'achieve' something.
Here's a quick list of things that can be accomplished in a short 15 mins. to 1 hour.
-Pay your bills
-Organize your taxes
-Clean your yard
-Cook a meal
-Practice your art/music/animation
Shorter and more 'dedicated' actions daily are more effective than pulling a long day event.