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From BBC News | Science/Nature | UK Edition:
Our natural daily 24-hour cycle could be stretched by an extra hour safely and simply by exposure to pulses of bright light, research suggests.
Experts say it could prove useful for astronauts adapting for long-term missions to Mars - where a day lasts an extra 40 minutes.
The team, from universities in the US and France, tested the light treatment successfully on 12 volunteers.
The study features in the Proceeding of the National Academy of Sciences.
Many species, including humans, have natural 'circadian rhythms' set to match the standard length day on Earth.
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