Sleep for the brain is like gas for a car. When the tank is full we get where we need to be. But as time goes on, the gauge falls lower and lower until the gas is gone and the car stops. Without the fuel it needs, the car is useless.
Our brains operate in a similar way. The only difference is the brain’s fuel is sleep. Without proper sleep, our minds begin to slow, unable to operate at their full potential. This happens until the mind becomes so deprived of the rest it needs, it breaks down. And without the commander-in-chief acting accordingly, the rest of the body pays the price.