Gotta disagree a bit here, sleep messes with your head more than we admit. @elliotl31 might downplay it, but fatigue strips away your usual caution. You stop double-checking links or questioning weird messages. It's like your mental guardrails just vanish. I've seen it happen where a tired friend clicked on a phishing email they'd normally spot. Lack of rest makes you open to mistakes you'd avoid when alert.