Pulsar’s PVT measures astronaut’s behavioral alertness while on the ISS For astronauts working aboard the International Space Station (ISS) in low-Earth orbit, getting adequate sleep is a challenge. For one, there’s that demanding and often unpredictable schedule. Maybe there’s an experiment needing attention one minute, a vehicle docking the next, followed by unexpected station repairs that need immediate attention. Next among sleep inhibitors is the catalogue of microgravityrelated ailments, such as aching joints and backs, motion sickness, and uncomfortable sleeping positions. And then there is the body’s thrown-off perception of time. Because on the ISS the Sun rises and sets every 45 minutes, the body’s circadian rhythm—the internal clock that, among its functions, regulates the

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