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I've come across such devices several times. Well intended, but I believe that if you're getting so tired that you may fall asleep you really shouldn't be driving and look for a nearby hotel instead. A sudden buzz or loud sound notification may scare me, which could cause accidents too.

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You are right, I am now much more attentive for this, but much people aren't.

<quote> The need for anti-sleep alarms is no joke. A poll conducted by the National Sleep Foundation showed that 60 percent of Americans have driven while feeling sleepy, and 37 percent admit to falling asleep at the wheel in the past year. In fact, sleepy driving can be deadly: The National Highway Traffic Safety Administration (NHTSA) reports that drowsy driving causes more than 100,000 car crashes -- and kills more than 1,500 people -- each year [source: Fenton].</quote>

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