There's a general misconception between being productive and being effective. One can fill their days by completing many mindless tasks and consider themselves as productive, but in the end hardly any of those tasks really matters. On the other hand, another person may only complete one or two tasks in a very short time during their day but these were critical tasks that could generate much higher values. This subseq…
> This is quite similar to the cognitive and decision fatigue principle which indicates that each of us only has a limited pool of cognitive resources and so we must be very selective in choosing what activities we engage in. Watch out — many of the studies which displayed “cognitive fatigue” (I assume you actually mean ego depletion) have not been replicated successfully. http://www.slate.com/articles/health_and_sci…
The specifics are disputed, but we needn't be so specific for the advise to hold.