Sleep is vital for people of any age. For teens, though, profound mental, physical, social, and emotional development requires quality sleep. Sleep benefits the brain and promotes attention, memory, and analytical thought. Aim of the study: Assess sleep quality among teenage female nursing students. Subjects and methods: Research design: A cross-sectional descriptive design was used to achieve aim of the current study. Setting: The current study was conducted in five secondary nursing schools in Sharkia Governorate. Subjects: A random multi-stage cluster sampling technique was used. The study sample composed of 400 female students who fulfilled inclusion criteria. Tools of data collection: A four-part structured interview questionnaire was developed by the researcher to collect the necessary data: Part I: Socio-demographic data sheet. Part II: Student’s health status. Part III: Student’s dietary habits. Part IV The Pittsburgh Sleep Quality Index (PSQI). Results: The study revealed that three-fifth of the study sample had poor sleep quality and showed that eat breakfast, perceived good diet and balanced diet were statistically significant independent negative predictor of poor sleep. Conclusion: Female nursing students complain from poor sleep quality. Recommendations: Health education programs regarding different strategies for improving sleep quality. Further researches to study factors affecting sleep in large scale.