Teaching can be one of the most satisfying jobs in the United States. Yet many American teachers say they feel overworked, undervalued, and underpaid. This has led to what education experts call ‘teacher burnout,’ a feeling of mental, physical, and emotional exhaustion. In all, nearly 50 percent of American teachers leave the profession before their fifth year. That information comes from a 2010 study by the advisory service McKinsey & Company. And, a 2016 study from Penn State University found that 46 percent of teachers report high daily stress. Teachers say the stress affects their sleep, health, teaching performance, and quality of life. The study identified mindfulness training as one promising solution for improving teacher well-being.