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Sleep quality shapes how we control impulses, weigh consequences, and judge risk. When sleep is poor, the brain’s executive-control system—especially in the prefrontal cortex—becomes less effective at planning, holding information, and evaluating options. At the same time, emotional reactivity from the amygdala can rise, making people more impulsive. This combination leads to poorer decision-making and less accurate assessments of risk, which often results in taking more or riskier bets than is wise. That’s why the statement about poor sleep impairing executive function, boosting impulsivity, and reducing risk assessment accuracy best captures how sleep affects decisions and risk. In contrast, good sleep tends to support better decision-making and steadier risk choices, while claims that sleep has no effect or that high-quality sleep increases risk-taking don’t align with what we know about how sleep supports cognitive control and risk evaluation.