> I really don't like this. Why is it useful if your car beeps at you when you doze off? You're either going to recognize that you're falling asleep, and pull off the road to rest, or recognize that you're falling asleep and decide to power through.

I fell asleep once while driving without recognizing that I was falling asleep. I only know I fell asleep while driving because that is the only plausible explanation for waking up while driving.