" A tired operator and an energized monitor create a problematic imbalance in the mind. As the monitor searches for forbidden content, it continuously brings to mind what it is searching for. Neuroscientists have shown that the brain is constantly processing the forbidden content just outside of conscious awareness. The result: You become primed to think, feel, or do whatever you are trying to avoid. "

― Kelly McGonigal , The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do to Get More of It