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Sleep deprivation disrupts the consumption of glucose - the main source of energy. When we are tired, it is difficult for cells to take glucose from the bloodstream. They remain hungry and we are tired. Because our body and brain require energy, we are drawn to sweets or caffeine. But sugar or coffee doesn't give the brain the energy it needs because it can't use it effectively. Therefore, self-control decreases - the most energy-consuming task for the brain.
The prefrontal cortex, an area of the brain that requires a particularly large amount of energy, is the first to be hit in an energy crisis. When the prefrontal cortex is weakened, it loses control over other areas of the brain. Left unattended, the alert system responds excessively to normal daily workloads. The body produces large amounts of stress hormones and decreases heart rate variability. The result is more stress and less self-control.
Kelly McGonigal, from Willpower. How to Develop and Strengthen.
The prefrontal cortex, an area of the brain that requires a particularly large amount of energy, is the first to be hit in an energy crisis. When the prefrontal cortex is weakened, it loses control over other areas of the brain. Left unattended, the alert system responds excessively to normal daily workloads. The body produces large amounts of stress hormones and decreases heart rate variability. The result is more stress and less self-control.
Kelly McGonigal, from Willpower. How to Develop and Strengthen.