Previous research has highlighted a link between electronic media use and sleep outcomes, but the nuanced impacts of screen use at different time of day and activities on adolescent sleep are underexplored. 831 participants underwent online assessment three times with interval of three months regarding their screen time and activities at specific times of the day, daytime sleepiness was assessed with the Epworth Sleepiness Scale, and sleep outcomes were assessed with the Pittsburgh Sleep Quality Index and Insomnia Severity Index. The associations between time spent on various screen activities, and sleep outcomes were examined respectively after controlling for inter-individual differences using the Random Intercept Cross-Lagged Panel Model models and LMMs. The RI_CLPM model revealed that both electronic screen time during daytime and after lights off in the evening in Wave1 negatively predicted the sleep quality in Wave2; the nighttime screen time before lights off in Wave1 significantly negatively predicted the seventy of insomnia in Wave2. Whereas no cross-lag and predictive effects of sleep outcomes on screen time were revealed. Moreover, daytime screen exposure, including T.V. watching and social media use, and nighttime music listening were negatively associated with sleep quality. Conversely, nighttime screen time of shopping and working/studying positively influenced sleep quality. Additionally, daytime screen time of T.V. viewing was positively associated with increased insomnia severity, whereas nighttime work/study-related screen time negatively affected insomnia severity. Nighttime screen time of music listening negatively predicted daytime sleepiness. The current findings contributed to the existing literature suggesting that the effects of electronic screen time on sleep depended on both the time of day and type of screen activities.

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时间和内容：关于屏幕时间和活动对青少年睡眠的影响的纵向研究

先前的研究强调了电子媒体使用与睡眠结果之间的联系，但一天中不同时间使用屏幕和活动对青少年睡眠的细微影响尚未得到充分探讨。 831 名参与者接受了 3 次在线评估，间隔三个月，评估他们的屏幕时间和一天中特定时间的活动，使用 Epworth 嗜睡量表评估白天嗜睡程度，使用匹兹堡睡眠质量指数和失眠严重程度指数评估睡眠结果。使用随机截取交叉滞后面板模型和 LMM 控制个体间差异后，分别检查了各种屏幕活动所花费的时间与睡眠结果之间的关联。 RI_CLPM模型显示，Wave1中白天和晚上关灯后的电子屏幕时间对Wave2中的睡眠质量有负面预测； Wave1 中关灯前的夜间屏幕时间显着负面预测了 Wave2 中的 70 例失眠。然而，没有发现睡眠结果对屏幕时间的交叉滞后和预测影响。此外，白天接触屏幕（包括看电视和使用社交媒体）以及夜间听音乐与睡眠质量呈负相关。相反，夜间购物和工作/学习的屏幕时间对睡眠质量有积极影响。此外，白天看电视的屏幕时间与失眠严重程度呈正相关，而夜间工作/学习相关的屏幕时间则对失眠严重程度产生负面影响。夜间听音乐的屏幕时间对白天的困倦有负面影响。目前的研究结果对现有文献作出了贡献，表明电子屏幕时间对睡眠的影响取决于一天中的时间和屏幕活动的类型。