The first suggestion is simple to implement: apply the heuristic of reducing whatever task list you come up with for a given day by somewhere between 25 and 50 percent. As mentioned, humans are wildly optimistic when we estimate how much time is needed to complete cognitive efforts. Blanket reduction rules, like cutting your initial task list by a

Refuel Your Brain Between Bursts

The most productive workers gave themselves an almost unbelievable amount of time off: a work-to-break ratio of fifty-two minutes of work to seventeen minutes of rest. So the last step to conserve your energy is even simpler than the first two: find moments in your working day to do nothing. And embrace them.