Clue to getting a good night's sleep discovered

US researchers are a step closer to discovering why some people can sleep peacefully despite the noise of modern life.

A process in the brain plays a key role in blocking out sound during sleep, they say, and it appears to be more effective in certain individuals. It may be possible to boost this effect using therapy, drugs or electronic devices, says a Harvard team.

The research is published in the journal Current Biology. US researchers studied 12 healthy volunteers at a sleep clinic over the course of three nights.

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