The last several decades have been characterized by the widespread usage of digital devices, especially smartphones. At the same time, there have been reports of both decline in sleep duration and quality and male fertility decline. The aim of this study was to assess the relationship between evening exposure to the light-emitting screens of digital media devices and measures of both sleep and sperm quality. Semen samples were obtained from 116 men undergoing fertility evaluation for the following sperm variables: volume (mL), pH, sperm concentration (million/mL), motility percentage (progressive% + non-progressive motility%), and total sperm count. Exposure to the screens of electronic devices and sleep habits was obtained by means of a questionnaire. Smartphone and tablet usage in the evening and after bedtime was negatively correlated with sperm motility (-0.392; -0.369; p < .05), sperm progressive motility (-0.322; -0.299; p < .05), and sperm concentration (-0.169; p < .05), and positively correlated with the percentage of immotile sperm (0.382; 0.344; p < .05). In addition, sleep duration was positively correlated with sperm total and progressive motility (0.249; 0.233; p < .05) and negatively correlated with semen pH (-0.349; p < .05). A significant negative correlation was observed between subjective sleepiness and total and progressive motility (-0.264; p < .05) as well as total motile sperm number (-0.173; p < .05). The results of this study support a link between evening and post-bedtime exposure to light-emitting digital media screens and sperm quality. Further research is required to establish the proposed causative link and may lead to the future development of relevant therapeutic and lifestyle interventions.

中文翻译：

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男性在夜间接触媒体设备发出的光与精子质量下降有关，并与睡眠质量指标相关。

过去几十年的特点是数字设备的广泛使用，尤其是智能手机。同时，也有睡眠时间和质量下降以及男性生育能力下降的报道。本研究的目的是评估夜间暴露于数字媒体设备的发光屏幕与睡眠和精子质量的测量之间的关系。精液样本来自 116 名接受以下精子变量生育力评估的男性：体积 (mL)、pH、精子浓度 (百万/mL)、运动百分比（进步百分比 + 非进步运动百分比）和总精子数。通过问卷调查获得电子设备屏幕的暴露情况和睡眠习惯。晚上和睡后使用智能手机和平板电脑与精子活力 (-0.392; -0.369; p < .05)、精子进行性运动 (-0.322; -0.299; p < .05) 和精子浓度 (- 0.169；p < .05），并且与不活动精子的百分比呈正相关（0.382；0.344；p < .05）。此外，睡眠时间与精子总数和进行性运动呈正相关（0.249；0.233；p < .05），与精液 pH 值呈负相关（-0.349；p < .05）。在主观嗜睡与总和进行性运动 (-0.264; p < .05) 以及总运动精子数 (-0.173; p < .05) 之间观察到显着的负相关。这项研究的结果支持晚上和睡前接触发光数字媒体屏幕与精子质量之间的联系。