More than one out of every three 12 to 15-year-olds wakes in the night at least once a week just to use social media, a study suggests.
The Cardiff team found more than one in five did so almost every night, leaving most constantly tired at school.
Out of all the 848 pupils surveyed in schools across Wales, one out of every three was constantly tired, but that proportion was smaller among those who got up at the same time every morning. Full article
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