The study from the Prince's Trust, the Prince of Wales's youth charity, finds that almost four in 10 pupils who fail to achieve at least five C-grades in their GCSEs do not have a set bedtime.
Young people with lower school grades were also twice as likely as their more successful classmates not to have regular family meal times while growing up.
The annual Prince's Trust Youth Index also discloses growing despair among the jobless generation of young people who have left school or university and are struggling to find employment.
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