Increased smartphone screen-time associated with lower sleep quality

Exposure to smartphone screens is associated with lower sleep quality, according to a study published November 9, 2016 in the open-access journal PLOS ONE by Matthew Christensen from the University of California, San Francisco, USA, and colleagues.

Smartphones are increasingly becoming part of everyday life, but questions remain about the effects of frequent use on sleep. Poor sleep is associated with health conditions such as obesity, diabetes and depression.

Christensen and colleagues sought to test the hypothesis that increased screen-time may be associated with poor sleep by analyzing data from 653 adult individuals across the United States participating in the Health eHeart Study. Participants installed a smartphone application which recorded their screen-time, defined as the number of minutes in each hour that the screen was turned on, over a 30-day period. They also recorded their sleeping hours and sleep quality.