Psychomotor vigilance task (PVT), is the "gold standard" of measuring sleepiness. The PVT measures your sustained attention using a short, 2-minute task. You can log your performance over time, and see how your PVT performance changes compared to how much sleep you receive.
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What's new in the latest 1.1
Last updated on 2017-05-06
More insightful dialog after PVT completes. Graphical touchups.