If alcohol is involved, you go down. You intended to neglect. If you throw your child in the pool, that is murder.
In the crack example, the mother purposefully left the kids in the car. It wasn’t an accident.
Did you intend to take that nap, or did you just fall asleep?
Were you tired because you are taking medication or because you stayed up all night partying?
Intent to do one thing doesn't prove or have anything to do with the intent to do something else.