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# Appy Dreams
Your smartphone could be making your sleep worse
Longer average screen-time was associated with poor sleep quality.
EXPOSURE TO SMARTPHONE screens is associated with lower sleep quality, a study has found.
The study was published in the open-access journal Plos One this week by Matthew Christensen from the University of California, San Francisco.
Christensen and colleagues sought to test the hypothesis that increased screen-time may be associated with poor sleep by analysing data from 653 adult individuals across the United States.
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.
While the authors’ findings cannot show causation or exclude the “effect-cause” that poor sleep could lead to more screen time, the association they found could fit with the theory that bedtime smartphone use may negatively impact sleep.
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