Sleep disruption primarily impairs frontal lobe function, affecting decision-making and willpower.

“Frontal load is first to go, I guess, right? So the decision decision-making the willpower section of the brain is the area where we we start to see the most reduction in performance uh with with sleep disruption which is important for not just like whether you're pushing a red or a blue button but also your ability to drive a car, your ability to make life-saving decisions if you work in a hospital, your ability to prevent yourself from, you know, eating a bag of potato chips, whatever whatever that decision-making capacity is is going to be impaired.”