Did you watch the recent TED movie about the effectiveness of rewards? When you reward yourself, is it for finishing creative tasks, or tasks that you just nee

Did you watch the recent TED movie about the effectiveness of rewards? When you reward yourself, is it for finishing creative tasks, or tasks that you just need to apply grit to? This is something I have been wondering about myself when it comes to 'autorewards' (or whatever it is called when rewarding oneself for tasks accomplished). I spend so many evenings avoiding doing the things I know exactly what I need to do.