What should you do if you feel drowsy while driving at night?

Answer: C — Open a window or vent for fresh air

If you feel drowsy while driving at night, the best course of action is to stop your car and take a nap. However, in the choices provided, opening a window or vent for fresh air is a common suggestion many drivers might think helps combat drowsiness. It can provide a temporary feeling of alertness, but it does not address the underlying issue of fatigue effectively. Feeling drowsy is a serious condition that can impair your reaction times and decision-making abilities, much like alcohol impairment. Simply opening a window doesn't counteract the fatigue; it might even distract from taking necessary action, like pulling over safely. The optimal response to drowsiness is to find a safe place to stop and rest, as fatigue can lead to dangerous situations. It’s important to prioritize safety by ensuring you’re well-rested before continuing your drive.