What is sleep and cognitive performance?

Example: A product manager sleeps five hours the night before a critical roadmap decision. She enters the meeting feeling functional — alert enough to speak in full sentences, recall the agenda, and follow the discussion. But her prefrontal cortex is operating at reduced capacity while her amygdala is firing 60% harder than normal. When an engineer raises a legitimate technical risk, she perceives it as a personal attack on her plan. When a stakeholder presents ambiguous market data, she locks onto the interpretation that confirms what she already believes. She dismisses a dissenting voice she would normally have engaged with. She leaves the meeting confident she made a strong call. She did not. She made an emotionally reactive, confirmation-biased decision while her internal monitoring system — the part of her brain that would normally flag "you are not thinking clearly" — was offline. Two weeks later, when the technical risk materializes exactly as the engineer predicted, she cannot understand how she missed it. The answer: she was cognitively impaired during the decision, and her impairment included the inability to detect the impairment itself.

This concept is part of Perceptual Calibration in the How to Think curriculum.