Smartphones keep you awake
 

Exposure to smartphone screens will stuff up your sleep, according to a new study.

Writing in the science journal PLOS ONE, which sounds more like a mathematics magazine for dyslexics, Matthew Christensen from the University of California, San Francisco and his chums wondered what the physical effects of increased smartphone use was having on the great unwashed.

Christensen and colleagues tested the hypothesis that increased screen-time may be associated with poor sleep by analysing 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.

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