One of the issues astronauts experience is changes in vision. Most astronauts on the ISS have to wear glasses during their flight. Microgravity causes changes in the shape of the eyeball.
Researchers have now developed a special sleeping bag which pulls fluids back out of the brain. It might also help with potential cardio problems and the brain fog astronauts sonetimes experience. One wonders if it could also be useful for people who are bedbound for a long period of time.
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