Scene Context: The crew in the Vitruvian capsules does not merely sleep; they learn and live in simulations while their bodies are sustained by gel, muscle stimulation, and somatic maintenance.
Essence of the Phenomenon: Real aerospace medicine is already seriously investigating induced torpor for deep-space missions and utilizes or tests countermeasures against muscle atrophy, including electrical stimulation. But a comprehensive regime where the body sleeps in a support medium while consciousness lives productively for years in artificial environments is an extrapolation of several real-world research vectors simultaneously.
Theoretical Extrapolation: The scenario assumes that synthetic torpor, total somatic support, and guided cognitive simulations have been merged into a single deep-space transit technology.