SpaceDailyCaptured
Six healthy men entered a simulated Mars spacecraft in 2010. Within three months they were moving less, and over 520 days the crew slept and rested progressively more—a slide into what researchers called “behavioural torpor,” possibly driven by confinement, monotony and dim artificial light.
Mars500 wrist monitors captured less active waking and more sleep and rest across confinement, but the authors' torpor analogy did not mean hibernation and the six men adapted differently.