Most people are constantly slightly behind schedule, and it's a damn demoralizing thing. Even if you have a fantastic day, you might barely catch up or still be a little behind.
Much, much, much better to be slightly ahead of schedule with whatever your routine metrics and actions you need to get done are.
If you've got 3 core areas that are all behind schedule, you might consider going as as far as to let two of them fall behind a moderate amount in order to get one of them slightly ahead of the curve. It's nice -- incredibly extraordinarily nice -- to know that something is proceeding according to plan, and that you've got some slack even if you turn in a couple duds of work cycles going forwards.
The real advantage isn't that it gives you more flexibility (though, that too) but that the additional pressure and neurosis from being behind schedule fades away.
Highly recommended -- look at your core goals and metrics. Try to get a little ahead of schedule with them, so even if a couple days in a row don't happen, you're still good.