
Back Ground: Insomnia can lead to major of side effect although there is limited data about its prevalence and risk factor among the adolescent age group Objectives: To estimate the prevalence of insomnia among secondary school female students in the east sector of Makkah, 2019, and to list the associated factors related to insomnia particularly smart devices use. Design: Cross-sectional analytic study Setting: Secondary schools in the east sector of Makkah. Patient and methods: random selection of students and distribution of the valid questionnaire. Main outcome measures: sociodemographic data, PSQI, and use of smart devices via questionnaire. Sample size: 341 students. Results: Based on Global PSQI Score 65.4% of the respondents are poor sleepers, while 34.6% are classified as good sleepers. Among the participants with good PSQI, 0.88% don’t use smart devices during the day, 2.93% used for less than one hour a day, 7.04% use for more an hour less than two hours,20.82% for 2 hours and more, and 2.93% used for an uncertain period a day. while the persons with poor PSQI,2.35% don’t use smart devices during the day, 4.11% used for less than one hour a day, 6.74% use for more an hour less than two hours,49.27% for 2 hours and more, and 2.93%use for an uncertain period which is statistically significant (P=0.026). Conclusion: Approximately half of the selected population is suffering from insomnia with mild dysfunction, which indicates the need for a further broad study of other sectors and cities. Limitation: Covering a large population in a limited time Conflict of interest: none