The unassuming little point of light in the centre of this image is something really quite special. Just 6000 light years away, it's the oldest star ever discovered. Going by the designation of SMSS J031300.36-670839.3, this star is older than the very galaxy which we live in, and formed when the Universe itself was still young.
Astronauts can suffer sleeping problems in space just as on Earth. Stress, heavy workloads, anxiety, background noise, light and air quality can all upset their body clocks. Minimizing sleep disturbances for astronauts is just one of the goals of the European Astronaut Centre's medical team.