A new study of 4,500 15 year-olds shows that a third of the girls and a fifth of the boys have problems sleeping.
Lack of sleep means that they are tired at school and as a result can also have learning difficulties.

A new study of 4,500 15 year-olds shows that a third of the girls and a fifth of the boys have problems sleeping.
Lack of sleep means that they are tired at school and as a result can also have learning difficulties.
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