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December 17 2012
Nasa is to test colour-changing lights on the International Space Station (ISS) as part of efforts to help astronauts on board sleep.
The US space agency will initially swap a fluorescent panel with a solid-state lighting module (SSLM) containing LEDs which produces a blue, whitish or red-coloured light depending on the time.
It says the move may help combat insomnia which can make depression, sickness and mistakes more likely.
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