A World Health Organization study suggests that one in four 11 to 15-year-olds in England have too little sleep. The Health Behaviour in School-aged Children report questions 3,398 11, 13 and 15-year-olds every four years. And 27% now say they are too tired to concentrate on their lessons - 17% of 11-year-olds, 28% of 13-year-olds and 42% of 15-year-olds.
The proportion of 15-year-olds who say they have have low moods at least once a week has also risen, from 40% to 50%. One in four 15-year-olds say they have self-harmed - and the proportion is rising faster among boys. Girls, though, are more likely to have too little sleep, 32% compared with 23% of boys.
Just one in six of the youngsters (15%) say they are physically active for at least an hour a day.
But seven in 10 take part in "vigorous" physical activity at least two to three times a week, with boys (74%) more likely to do so than girls (63%).
The study also suggests children are becoming less likely to take part in risky behaviour:
- just 3% say they have smoked at least three times in the past 30 days, while 7% have drunk alcohol
- 21% of 15-year-olds have tried cannabis, while 20% have had sex, down from 41% in 2002
And when it comes to food:
- 63% eat breakfast every day
- 44% meet the government recommendations of eating five portions of fruit and vegetables every day
- 39% usually eat a meal with their family every day, down from 51% in 2014
