On earth, zero gravity mode isn’t about feeling weightless so much as feeling supported using gentle elevation to nudge your body and legs into a more relaxed alignment. This distinction matters. “Most claims about sleep benefits tend to be exaggerated in the marketing world,” says Erin Flynn-Evans, director of the Fatigue Countermeasures Laboratory at NASA Ames Research Center. “What really matters is whether such claims can stand up to scientific scrutiny.” NASA’s research simply documents…

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