People can fall asleep at the wheel for reasons out of their control, and when that happens their license is suspended pending medical approval. People have sleep disorders, can be overworked, side effects of medication, seizures, etc..
People who are DUI do so with no ill will, but knowingly and willing operate a vehicle in an impaired state.
Shit, we've all been there. You're drunk, but who is going to drive you home? Nobody around, and you think about it for a minute, "I'll make it home no problem this time, it's all good."
sleep it off in your fucking car.
so yea, an over-the-top comparison.