Space travel ’causes sleep problems’ BBC

Astronauts on extended missions into space may experience severe disruption to their sleep, scientists have found. Researchers in the US have discovered that the brain’s ability to control the body’s sleep cycle is reduced when it is not exposed to the Earth’s ‘natural time cues’. Their results could mean that longer missions into space, such as to Mars, could be jeopardised by performance problems caused by lack of sleep.