A research app released by NASA can help scientists study what’s going on in the body when fatigue sets in and the telltale signs that could alert you in time. (Credits: NASA/Ames Research Center/Dominic Hart)

For pilots, fatigue can lead to small mistakes with significant consequences. A NASA app shows what’s going on in the body when fatigue prevents you from working safely – and which telltale signs could alert you in time.

The app features a reaction-time test to gauge alertness and a streamlined process for gathering information. The app is based on the psychomotor vigilance task (PVT) that NASA already uses on the International Space Station to collect data from astronauts.

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