Who Needs Sleep?

University of Pennsylvania researchers have tied a new variant in the BHLHE41 gene to some people's ability to get by on less sleep. Previous work from another group implicated a different variant in that gene to sleep deprivation.

As they report in the journal Sleep, UPenn's Allan Pack and his colleagues studied a cohort of twins that was exposed to acute sleep deprivation. The researchers also tested the participants' cognitive skills.

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