[W]e are prone to exaggerate the consistency and coherence of what we see.… System 1 runs ahead of the facts in constructing a rich image on the basis of scraps of evidence.

Daniel Kahneman, Thinking, Fast and Slow. (ISBN: 9780374533557) p.114

People who are cognitively busy are also more likely to make selfish choices, use sexist language, and make superficial judgements in social situations…The self-control of morning people is impaired at night; the reverse is true of night people…[S]elf-control requires attention and effort.

Daniel Kahneman, Thinking, Fast and Slow. (ISBN: 9780374533557) p.41

[T]he idea of mental energy is more than a mere metaphor. The nervous system consumes more glucose than most other parts of the body, and effortful mental activity appears to be especially expensive in the currency of glucose. When you are actively involved in difficult cognitive reasoning or engaged in a task that requires self-control, your blood glucose level drops. The effect is analogous to a runner who draws down glucose stored in her muscles during a sprint. The bold implication of this idea is that the effects of ego depletion could be undone by ingesting glucose…

Daniel Kahneman, Thinking, Fast and Slow. (ISBN: 9780374533557) p.43