From the abstract:
Recent medical progress is quickly advancing our ability to induce torpor, a deep sleep hibernation-like state, in humans for extended periods of time. The authors propose to place crew and passengers in a prolonged hypothermic state during space-mission transit phases (outbound and Earth-return) to significantly reduce the system mass, power, habitable volume, and medical challenges associated with long-duration space exploration.
This is really cool, but there’s no way I’d sign up to be one of the first to test it. Seriously, the ethical concerns of actually proving this technology are going to be huge. I hope it works out, though. I’m inclined to think we need something like this in order to reach even destinations as close as Mars.