
Exposure to
smartphone screens is associated with lower sleep quality, according to a study
published 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.
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.
Source: Eurekalert
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