Answer:
Take a break. Or, have a KitKat. (Just a humorous addition to this answer)
Step-by-step explanation:
She has been driving 5 hours nonstop, right? It is the best option for a driver who has been feeling drowsy throughout the rest of the road trip. Otherwise, her energy would be depleted and that she will be disoriented and be less wary of the sense of where she is supposed to got. Plus, she is very lucky if she is driving below the flyway as there is an emergency bay there, she could take a nap there. But in the case of the suburbs or rural places, she could park somewhere where people would not see and could take a rest there. Seriously, it is OK to take a stop now and then.