The key to it all is if you are willing to go to trial in front of a jury. I simply can't imagine 12 people convicting someone if they can reasonably show that the ENTIRE POINT was to NOT drive while drinking. Although, as mightier than though judgmental many on here seem to be, my faith in people may be entirely misplaced....
I’ve been the foreman on a couple of juries. Not a lawyer.
The prosecution gives the jury the law, and the facts. In this case they would say, “If a person is behind the wheel, and the car is running, and they are sleeping, this meets the rule for OWI.” Then they have a police officer testify that the man was indeed behind the wheel, the car was running, and he was sleeping. The defense will try to claim he wasn’t drinking and driving, but the jury will likely find that’s not the law.
All this being said, it will never go to a jury, so it doesn’t matter.