Hey @anthrovegan there have been some recent studies showing that mental fatigue can cause us to reach exhaustion more quickly. I would think that stress would be a major form of mental fatigue and reading further into it, there is only one real way to improve the output and that is to train when you are under these fatigued states:
https://www.sciencedaily.com/releases/2009/02/090224132915.htm

Either way, a great piece of writing and thanks for sharing.
Regards @run.vince.run