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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US Attorney General Jeff Sessions is considering using DNA tests to determine relatedness between adult and child migrants, the Daily Caller reports.

Bloomberg reports that Brainstorm Cell Therapeutics plans to offer a treatment it is developing under the "right to try" law for hundreds of thousands of dollars.

In Nature this week: expansion of disease-resistance genes among long-lived oak trees, and more.

In a proof-of-concept study, researchers report being able to determine age from dried bloodstains, Discover's D-brief blog reports.