More more people have a condition that leaves them so sleepy they are unable to work — even after a full night's rest — than previously thought.Researchers in the US estimated that as many as one in 70 individuals, or nearly 5million Americans, have 'idiopathic hypersomnia'.That is many more times previous estimates, which labeled the alleged disease as 'rare' and said fewer than 200,000 people were affected.
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