In the fast pace of modern life, we often underestimate sleep – we shorten it due to obligations, sacrifice it for fun, or ignore it in the name of productivity. But sleep is not a break from life – it is the foundation of a healthy body and a balanced mind. Science confirms time and again that quality sleep is not a habit, but a vital physiological need, comparable to a healthy diet and regular physical activity. When we sleep too little or poorly, it not only affects our concentration the next day – it also affects our immune system, emotions, metabolism, heart, and even long-term brain health.