Hey, you know what NASA should do? If it’s planning on a Martian mission but it’s concerned about the conditions in small enclosed spaces for long periods of time and the effect on a person, NASA should just recruit young Manhattanites who might even pay for the privilege of doubling the size of their apartments to 300 square feet.
They’re used to the cramped conditions. Also, it would be a lot of Manhattanites blasted into space. A win for everyone involved.