Genetic Mutation may be why some people need less Sleep

[mad30]

Margaret Thatcher famously got by on four hours a night as Prime Minister, while George W. Bush wanted at least eight. The differing need for sleep extends even to those with countries to run.

Scientists may now be able to explain why: new research suggests that some of us are genetically programmed to spend longer in the Land of Nod than others.

Researchers have for the first time identified a genetic mutation linked to the amount of sleep people need.