Device monitors how alert you are by Vigo (12 images)

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A new device monitors how alert you are during your Christmas hangover - and even nudges you if you fall asleep. The unique wearable gadget uses an infrared sensor that monitors eyes to measure blink rates, blink duration and eye closing and opening time ratios. It includes a built-in accelerometer which detects head motion to indicate whether you are asleep, or if you've been sitting down for too long. The special tool, called Vigo, looks like a Bluetooth headset and is only 15cm by...
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