One negative aspect of being in space is that many travellers experience vision problems but scientists have created a hi-tech sleeping bag that could put a stop to this

The zero-gravity experienced in space caused fluids to float into the head and squash the eyeball over time.

This is one of the most severe issues experienced by astronauts but this new sleeping bag moves fluid from the head downwards into the feet to prevent pressure build-up.

The developer plans to make the device available within the International Space Station.

Over 50 per cent of astronauts who spend more than 6 months in space experience vision problems including becoming far sighted and having difficulty reading.

But the lead researcher says he doesn’t know “how bad the effects might be on a longer flight, like a two-year Mars operation.

He hopes the progressive flattening at the back of the eyeball, swelling of the optic nerve and vision impairment can be prevented by using this sleeping bag.