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NASA science sleep space_00000530
NASA science sleep space_00000530

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    Astronauts caught in 'a perpetual jetlag'

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Astronauts caught in 'a perpetual jetlag'

With sunrise every 90 minutes, it's hard to sleep aboard the International Space Station. Here are tips to help astronauts -- and those on Earth -- rest.

Astronauts caught in 'a perpetual jetlag'

With sunrise every 90 minutes, it's hard to sleep aboard the International Space Station. Here are tips to help astronauts -- and those on Earth -- rest.