Because you actually might not know what activities truly engage your attention and satisfy you, he says, it can be helpful to keep a diary of what you do all day and how you feel while doing it. Then, try to do more of what's rewarding, even if it takes an effort, and less of what isn't. Where optimal experience is concerned, he says, "'I just don't have the time' often means 'I just don't have the self-discipline.

Rapt: Attention and the Focused Life