Leeds research blames mobile phones for pupils' lack of sleeppublished at 08:17 British Summer Time 11 October 2017
Research carried out in West Yorkshire suggests many children are struggling at school because they're not getting enough sleep.
A study by Leeds University shows over a third of primary school pupils get by on less than eight hours a night.
Mobile phones and computers are being blamed for keeping them awake.
The findings revealed that, despite the NHS recommendation of ten hours, 36% of primary school age children get eight hours or less sleep a night and 15% get seven hours or less.
Researchers at the university say such low levels of sleep are likely to have a negative impact on a child’s ability to function in the classroom and reach key milestones.