The smartphone occupies a substantial part of adolescents’ daily life, from the moment they wake up to, for some, well beyond their bedtime. The current study compared the impact of adolescents’ daytime, pre-bedtime, and post-bedtime smartphone use on their sleep quality. In addition, it explored the differential effects of lean-back and lean-forward smartphone apps. We collected data from 155 adolescents across 21 days using smartphone tracking (745,706 app activities) in combination with experience sampling (1,950 sleep quality assessments). We found no significant effects of daytime and pre-bedtime smartphone use on sleep quality, but a negative association of post-bedtime smartphone use with sleep quality (β = −.09). The association between smartphone use and sleep quality varied across app categories: Time spent on lean-forward apps around bedtime, such as social media apps right before (β = −.08) and game apps after bedtime (β = −.23), was associated with lower sleep quality. The use of lean-back apps (i.e., video players) was not associated with sleep quality, neither before nor after bedtime.

中文翻译：

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青少年的数字夜生活：白天和夜间使用智能手机对睡眠质量的比较影响


智能手机占据了青少年日常生活的很大一部分，从他们起床的那一刻起，对某些人来说，甚至超出了他们的就寝时间。目前的研究比较了青少年白天、睡前和睡后使用智能手机对其睡眠质量的影响。此外，它还探讨了向后倾斜和向前倾斜智能手机应用程序的不同效果。我们使用智能手机跟踪（745,706 个应用程序活动）结合经验采样（1,950 次睡眠质量评估）收集了 155 名青少年在 21 天内的数据。我们发现白天和睡前使用智能手机对睡眠质量没有显着影响，但睡后使用智能手机与睡眠质量呈负相关（β = -.09）。智能手机使用与睡眠质量之间的关联因应用类别而异： 就寝时间在前倾应用上花费的时间，例如睡前社交媒体应用 (β = −.08) 和睡后游戏应用 (β = −.23)，与较低的睡眠质量有关。使用靠背应用程序（即视频播放器）与睡眠质量无关，无论是在睡前还是睡后。