Tired is a state of physical or mental exhaustion that can result from various factors, such as lack of sleep, prolonged activity, or stress. When someone feels tired, they may experience reduced energy levels, difficulty concentrating, and a strong desire to rest or sleep. This feeling can affect daily activities and overall well-being. Common causes of tiredness include insufficient sleep, poor nutrition, and high levels of stress. Addressing these factors can help improve energy levels and reduce feelings of tiredness.