NASA will put 12 volunteers to the test in beds angled downwards to test the effects of slightly more pressure on the head, reports Interesting Engineering.

Twelve volunteers will spend the next month of their lives in bed for the love of science. However, this isn’t a traditional NASA sleep study. The beds of each volunteer will be tilted downwards at a six-degree angle. And the volunteers have to stay there the whole time. No bathroom breaks, no showering, no sitting up to eat or drink.