<IMG alt="Sleep deprivation chart" src="http://pakedu.net/wp-content/uploads/2013/05/wpid-67406434sleepdeprivation624.jpg" width=624 height=385> Sleep deprivation is a significant hidden factor in lowering the achievement of school pupils, according to researchers carrying out international education tests.
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<P>It is a particular problem in more affluent countries, with sleep experts linking it to the use of mobile phones and
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