Decision-making quality is profoundly sensitive to sleep status — with sleep deprivation producing increased risk tolerance, greater susceptibility to sunk cost fallacy, reduced consideration of negative outcomes, impaired ability to update beliefs with new evidence, increased reliance on emotional rather than analytical processing, and a characteristic overoptimism that produces confident, rapid decisions that are statistically worse than the same person's well-rested decisions by measurable margins.
Role
Decision quality degradation from sleep deprivation is particularly insidious because sleep-deprived individuals typically feel more confident in their decisions — the emotional risk-tolerance increase produced by sleep deprivation includes a subjective confidence boost that masks the underlying quality deterioration. This produces the dangerous combination most consequential in high-stakes professional and personal contexts: worse decisions made with greater confidence. The executive, investor, or physician making consequential decisions while sleep-deprived is not merely tired — they are in a neurologically altered state that specifically impairs the accuracy of the decisions they are making while simultaneously increasing their confidence in those decisions.