Research: Light Emitted from Media Devices at Night is Associated with Decline in Sperm Quality

By B.N. Frank

Medical warnings about the growing list of health risks associated with artificial light (both Bluelight and White) from screens and light bulbs have been published in variety of sources including the New York Times. Now research indicates it could be affecting sperm quality as well.

From Oxford Academic:

0029 Light Emitted from Media Devices at Night is Associated with Decline in Sperm Quality

A Green, S Barak, L Shine, A Kahane, Y Dagan, Y Dagan
Sleep, Volume 43, Issue Supplement_1, April 2020, Page A12,
27 May 2020



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 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 sperm quality.


Semen samples were obtained from 116 men adults aged between 21 and 59 (35.2 ±7.2) undergoing fertility evaluation for the following sperm variables: volume (mL), pH, sperm concentration (n/mL), motility percentage (progressive% + non-progressive motility%) and total sperm count. Exposure to the screens of electronic devices and sleep habits were obtained by means of a questionnaire.


Smartphone and tablet usage in the evening and after bedtime was negatively correlated (p<0.05) with sperm motility, sperm progressive motility, and sperm concentration, and positively correlated with the percentage of immotile sperm. In addition, sleep duration was positively correlated with sperm total and progressive motility and negatively correlated with semen pH (p<0.05). A significant negative correlation was observed between subjective sleepiness and total and progressive motility as well as total motile sperm number (p<0.05).


The results of this study revealed a link between evening and post-bedtime exposure to light-emitting digital media screens and sperm quality. To the best of our knowledge, this is the first study to report these types of correlations between sperm quality and exposure time to SWL emitted from digital media, especially smartphones and tablets, in the evening and after bedtime.

Of course there is plenty of research that has already determined Electromagnetic Radiation from smartphones and other digital and wireless devices also affects sperm health (see 1, 2) and much more. In fact – there is a class action lawsuit against several Smartphone models for exceeding U.S. RF radiation safety levels.

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