ABSTRACT

Objective

Determine whether automated changes in electronic screen color temperature of personal electronic devices is associated with changes in objective and self-reported indices of sleep and mental health in young adults, as well as determine feasibility and acceptability of the experimental manipulation.

Participants

A single-blind randomized controlled trial was conducted at a large public university in the Pacific Northwest region of the United States. Fifty-five participants (female=78%, mean age=19.45 years) who reported using a smartphone and/or laptop computer two hours before bedtime were randomized into either an experimental group (EG; n=29) or active control group (ACG; n=26).

Methods

Both the EG and ACG had installed on their devices a piece of software that automatically lowers the color temperature of these devices’ screens as the day progresses (“f.lux”). However, only the EG had the blue-light-reducing features activated, and participants were blind to condition. Before and after the one-week long experimental manipulation period, participants completed the Pittsburgh Sleep Quality Index (PSQI), Pediatric Daytime Sleepiness Scale (PDSS), Pre-Sleep Arousal Scale (PSAS), and Patient Health Questionnaire (PHQ) and wore an actiwatch for seven consecutive nights.

Results

Participants in the EG did not show greater improvement in objective sleep, self-reported sleep, or mental health compared to participants in the ACG. Participants in the EG rated the software as more distracting and purposely disabled the software more often compared to participants in the ACG.

Conclusions

Automated diurnal variation in electronic screen temperature in personal devices did not improve sleep or mental health in young adults.

中文翻译：

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电子屏幕温度自动昼夜变化对年轻人睡眠质量的影响：一项随机对照试验

摘要

客观的

确定个人电子设备的电子屏幕色温的自动变化是否与年轻人的客观和自我报告的睡眠和心理健康指数的变化有关，并确定实验操作的可行性和可接受性。

参与者

在美国太平洋西北地区的一所大型公立大学进行了一项单盲随机对照试验。在睡前两小时报告使用智能手机和/或笔记本电脑的 55 名参与者（女性=78%，平均年龄=19.45 岁）被随机分为实验组（EG；n = 29）或主动对照组（ACG ; n = 26)。

方法

EG 和 ACG 都在他们的设备上安装了一个软件，该软件会随着时间的推移自动降低这些设备屏幕的色温（“f.lux”）。然而，只有 EG 激活了减少蓝光的功能，并且参与者对条件视而不见。在为期一周的实验操作期之前和之后，参与者完成了匹兹堡睡眠质量指数（PSQI）、小儿白天嗜睡量表（PDSS）、睡前觉醒量表（PSAS）和患者健康问卷（PHQ），并佩戴actiwatch 连续七个晚上。

结果

与 ACG 的参与者相比，EG 的参与者在客观睡眠、自我报告的睡眠或心理健康方面没有表现出更大的改善。与 ACG 的参与者相比，EG 的参与者认为该软件更容易分散注意力并故意禁用该软件的频率更高。

结论

个人设备中电子屏幕温度的自动昼夜变化并没有改善年轻人的睡眠或心理健康。