The science of stamina has advanced to the point where individuals, teams, and whole organizations can, with some straightforward interventions, significantly increase their capacity to get things done.
by Tony Schwartz and Catherine McCarthy

The core problem with working longer hours is that time is a finite resource. Energy is a different story. Defined in physics as the capacity to work, energy comes from four main wellsprings in human beings: the body, emotions, mind, and spirit. In each, energy can be systematically expanded and regularly renewed by establishing specific rituals—behaviors that are intentionally practiced and precisely scheduled, with the goal of making them unconscious and automatic as quickly as possible…
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How well do you handle your energy?
Do you schedule in time to recharge?
I know I do. For example; we try and keep Sundays free of all pre-arranged activities, and then please ourselves how we spend it, including having pyjama days! how decadent!
It certainly helps I must say… try it…