Medical Disclaimer: This calculator is provided for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. The recommendations are based on general sleep science research and shift work literature, but do not account for individual medical conditions. If you have concerns about shift work sleep disorder, excessive fatigue, or any sleep-related medical condition, please consult with a qualified healthcare provider or sleep specialist. Nurses should also be aware of institutional fatigue policies and patient safety considerations.