With every case being unique, it is difficult to predict the results of a specific case, but we can look at similar past cases to get a good idea.
In State v. Carter (1972), the court held that a defendant who was found asleep and intoxicated in his vehicle which was stopped at a stop sign and had the engine running was guilty of a DWI. Based on circumstantial evidence, they inferred that the defendant must have driven his vehicle on the highway while intoxicated, then fell asleep.
In State v. Fields (1985), the court did not find that the defendant was “driving” when he sat behind the steering wheel in the driver’s seat and started the car’s engine in order to make the heater operable, but the car remained motionless.