In order to recharge over the weekend or during your days off, you must have peace of mind. Assurance that your team is doing what they're suppose to, that you have accomplished the tasks necessary for the week, and you've tied as many loose ends as possible.
That's not always realistic, but strive to have a weekend like that every once in a while. Work hard and be driven every hour during the week. Set extremely clear goals to your team and make sure they understand what's expected. Make those last few phone calls and when Friday comes, your mind can truly rest.