There is an interesting twist to true productivity that I have observed, and that is the place of taking a break.
We always imagine maximum productivity to involve working and working and working, tirelessly, without taking a break. Working in a way only a god can.
Yet, we must also know that taking a break from the work and resting your body, soul and spirit is also important.
You cannot plan to optimise your schedule for maximum productivity without including rests and breaks.
Next time you need to take a nap, do not feel guilty about it or feel like you wasting time. It is required for maximum productivity.