As a final reading it is worth taking a look at this article from the Harvard Business Review 'Manage Your Energy Not Your Time' [1] click on the link to open the PDF
Links:
[1] https://acping.net/sites/default/files/Manage%20Your%20Energy%20Not%20Your%20Time%20-%20HBR%20Oct%202007.pdf
[2] https://acping.net/category/section-name/vision-quest-17