Article: Only need four hours sleep? It's in the genes.

Byline: ROBIN YAPP

MARGARET Thatcher famously needed just four hours sleep a night during her time as Prime Minister.

But her ability to run the country on such little rest may have been due to her genes, rather than simply her iron will.

Scientists have found a gene mutation which explains why some people can function normally despite sleeping less than the rest of us.

But there may be a price to pay - sleeping less can increase the likelihood of an early death.

A study at Wisconsin University Medical School in the U.S. looked at the sleeping habits of fruit flies, which share many of the same genes as humans and have similar sleep patterns.

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