Background: The internet's extensive use in the twenty-first century has had a significant impact on our way of life. Despite the fact that technology has improved many aspects of our lives and is now an essential part of daily living, such as job, private life, and social interaction. Aim: Aim to explore internet addiction among psychiatric nurses and its effects on sleep quality and psychological distress. Subjects and Methods: A descriptive correlational design was employed with a purposive sample of 50 psychiatric nurses in the psychiatric department at Zagazig University Hospitals. Data collection was conducted using the Internet Addiction Test (IAT), Kessler Psychological Distress Scale (K10), and Sleep Quality Scale (SQS). Results: less than two thirds (62%) of nurses had severe problems related sleep quality and 28% of them had moderate problem related sleep quality. More than one third (40%) of studied nurses suffered from severe internet addiction, (44%) of them suffered from moderate internet addiction, while 8% of them had mild and normal internet addiction. Conclusion: The study of psychiatric nurses found that internet addiction has a positive correlation with psychological distress and sleep problems. Recommendations: Based on the study's findings, it appears important to implement periodic educational courses, refer them to counseling facilities, and conduct interventional studies to assess the efficiency of such programs.