How to Avoid a Fatigued Day

I think a lot of us have that little lull in the middle of the day. Is there any way to salvage that time and make it more useful? I think it's by recognizing first and foremost that you're not the same person at three o'clock, that you are nine o'clock in the morning. And so what I would urge people to do is to take those fluctuations of energy into account.