Suppplementary file 2. Data file.dta

We used the standard and validated Pittsburgh Sleep Quality Index (PSQI), which was developed by researchers at the University of Pittsburgh in 1988 AD. The questionnaire included baseline variables like age, sex, academic year, and questions addressing participants’ sleep habits and quality i.e. PSQI. The PSQI assesses the sleep quality during the previous month and contains 19 self-rated questions that yield seven components: subjective sleep quality sleep, latency, sleep duration, sleep efficiency and sleep disturbance, and daytime dysfunction. Each component is to be assigned a scored that ranges from zero to three, yielding a PSQI score in a range that goes from 0 to 21. A total score of 0 to 4 is considered as normal sleep quality; whereas, scores greater than 4 are categorized as poor sleep quality.Data collected from students through the Google forms were extracted to Google sheets, cleaned in Excel, and then imported and analyzed using STATA 15. Simple descriptive analysis was performed to see the response for every PSQI variable. Then calculation performed following PSQI form administration instructions.本研究采用经标准化验证的匹兹堡睡眠质量指数（Pittsburgh Sleep Quality Index, PSQI），该量表由美国匹兹堡大学的研究人员于1988年编制。该问卷涵盖年龄、性别、学年等基线变量，以及针对受试者睡眠习惯与睡眠质量的相关问题，即PSQI量表条目。PSQI用于评估受试者近一个月内的睡眠质量，共包含19个自评问题，涵盖7个维度：主观睡眠质量、入睡潜伏期、睡眠时长、睡眠效率、睡眠障碍以及日间功能障碍。每个维度的评分范围为0至3分，最终PSQI总分为0至21分。当PSQI总分为0~4分时，视为睡眠质量正常；总分高于4分则归类为睡眠质量不佳。本研究通过谷歌表单（Google Forms）收集的学生数据，先被导出至谷歌表格（Google Sheets），随后在Excel软件中进行数据清洗，再导入STATA 15软件进行分析。首先对所有PSQI相关变量进行简单描述性分析，以了解各条目应答情况；随后严格遵循PSQI量表的施测指导进行评分计算。