A study has shown men who use their smartphone at night risk damaging their fertility.
Scientists from Israel have found that greater exposure to light-emitting devices in the evening and after bedtime is linked with poor sperm quality, reports the Telegraph.
More than 100 men aged between 21 and 59 donated semen for the study, as well as completing a questionnaire about their sleep habits and use of electronic devices.
Dr Amit Green, from the Sleep and Fatigue Institute at the Assuta Medical Centre in Tel Aviv, said: 'Smartphone and tablet use in the evening and after bedtime was correlated with decline in sperm quality.
"Furthermore, smartphone use in the evening, tablet use after bedtime and television use in the evening were all correlated with the decline of sperm concentration.
"This is the first study to report these types of correlations between sperm quality and exposure time to short-wavelength light emitted from digital media, especially smartphones and tablets, in the evening and after bedtime."
The study also found a link between longer sleep duration and higher sperm total and greater progressive motility.
In contrast, greater sleepiness was associated with poorer sperm quality.
The findings were published in the journal Sleep.
