Margaret Thatcher notoriously got by with just four hours of sleep. Now a scientific study has revealed a gene variant that may have given the 'Iron Lady' her unique sleeping habits.Researchers at the Center for Applied Genomics in Philadelphia discovered that people carrying the gene variant p.Tyr362His are able to function normally on fewer than five hours of sleep per night.Scientists studied 100 sets of twins to find out which genetic mutations were responsible for differing sleep patterns, and found that those with the variant chose to sleep for less time than those without it.
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