Many teenagers do not believe they are getting enough sleep to remain alert at school and stay healthy, research suggests.

Girls are more concerned about their sleeping habits than boys, according to the study, and youngsters are more likely to say they are not getting enough as they get older.

More than one in four girls aged 14 and 15 (28%), and just over one-fifth of boys the same age (22%) believe they do not sleep enough to concentrate on their studies, according to the Schools Health Education Unit.

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