Why some people need less sleep

It’s long been recognised that some people appear to need less sleep than others but now scientists believe they may be a step closer to knowing why.

A team from the University of Utah has found that patterns of neural connections in the brains of so-called “habitual short sleepers” can make them more efficient sleepers.

But they may also be more tired than they realise, say the researchers.

The study of 1200 people used fMRI scans to determine their sleep patterns over a month. The group was divided into those who slept less than six hours a night and those who slept longer than that.

The short sleepers were further divided into groups that felt drowsy and those who felt they were functioning normally.

The researchers found short sleepers had enhanced brain connectivity.

“Short sleepers denying

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