‘Sleep deprivation puts astronauts’ lives in danger’

Lack of sleep was one of the many hazards of space travel not explored in the blockbuster movie Gravity.

Yet a new study has found many astronauts suffer serious levels of sleep deprivation that could be putting their lives in danger.

Scientists studied the sleep patterns of 64 astronauts on 80 space shuttle missions and 21 International Space Station (ISS) crew members before, during, and after spaceflight.