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November 10, 2016 08:00 am

Increased Smartphone Screen-Time Is Associated With Lower Sleep Quality, Says Study

A new study from the University of California is the latest to show that increased smartphone screen-time can lower one's quality of sleep, which can lead to various negative health conditions such as obesity, diabetes and depression. Medical Xpress reports: 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. The researchers found that each participant totaled an average of 38.4 hours over this period, with smartphones being activated on average for 3.7 minutes in each hour. Longer average screen-time was associated with poor sleep quality and less sleep overall, particularly when smartphones were used near participants' bedtime. The authors state that their study is the first to measure smartphone exposure prospectively, but caution that the study also had some important limitations, including the self-selection of study participants and self-reporting of data. The study has been published in the journal PLOS ONE.

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