Sleep study shows a lack of sleep affects our genes

Researchers say a lack of sleep changes our genes, which means it affects our bodies and can even make us ill.

The team at the University of Surrey tested the blood of people who had different amounts of sleep.

The study showed that more than 700 genes changed when people had slept only 6 hours a night for a week.

This is important because the genes are all linked to protein which helps rebuild tissue in the body.

Researchers say this shows not enough sleep could make it difficult for your body to mend.

source: http://www.bbc.co.uk/newsround/21587755