Psychological stress is one of the most common challenges faced by students in modern society, resulting from academic demands, social pressures, and personal responsibilities. While a moderate level of stress may sometimes motivate individuals to perform better, excessive and prolonged stress can have serious negative effects on both physical and mental health. One of the most significant consequences of psychological stress is its impact on sleep quality, which directly influences academic performance and learning outcomes. Stress often makes it difficult for individuals to relax and fall asleep. Students experiencing anxiety and excessive worry may suffer from insomnia, frequent awakenings during the night, or poor-quality sleep. As a result, they often feel tired and exhausted during the day, reducing their ability to focus and perform effectively in academic settings. Sleep plays a vital role in memory consolidation, information processing, and cognitive functioning. Adequate sleep allows the brain to organize and store information learned during the day. When sleep quality is compromised due to stress, concentration, attention, memory retention, and problem-solving abilities may decline significantly, leading to lower academic achievement. Furthermore, psychological stress can reduce motivation and increase feelings of frustration, discouragement, and emotional exhaustion. Students under continuous stress may find it difficult to engage actively in learning activities, complete assignments efficiently, or prepare effectively for examinations. Research indicates a strong relationship between stress and sleep disturbances. Stress negatively affects sleep quality, while sleep deprivation can further increase stress levels, creating a cycle that negatively impacts mental health and academic success. Breaking this cycle is essential for maintaining both educational performance and personal well-being. Effective stress management strategies include regular physical exercise, proper time management, relaxation techniques, and maintaining healthy sleep habits. Limiting screen time before bedtime and seeking emotional support from family, friends, or counselors can also help reduce stress and improve sleep quality. In conclusion, psychological stress significantly affects sleep quality and academic achievement. Addressing stress through healthy coping strategies and balanced lifestyles can improve students' well-being, enhance learning outcomes, and contribute to greater academic success. Al-Mustaqbal University is the leading private university among Iraqi private universities.