As ganked from engadget,
Need further confirmation that an IV drip of 5-Hour Energy is what your body really needs? Look no further than Murata’s newfangled fatigue sensor. . . . [T]his compact device is built by “integrating a photoplethysmographic sensor, which measures a pulse and a blood oxygen saturation level, and electrodes that measure electrocardiogram (ECG).” We’re told that the unit measures a fatigue degree (reported on a 1 to 100 scale) based on the “pulse, blood oxygen saturation level and electrocardiogram measured by the sensing parts.”
Who is going to be the first lawmaker to try to mandate fatigue testing for truckers, pilots and other creatures of the night?