The correct answer is D. You have improved night vision.
Explanation:
Drowsiness occurs as you feel extremely tired or sleepy, this, in the case of driving, affects your body in different ways and poses an important hazard. Indeed, drowsiness causes the driver is less alert and therefore has a slower reaction time and less concentration; this makes the driver more prompt to have an accident, drive faster than he/she should, and even got out of the line. However, feeling drowsy does not causes you have improved night vision because drowsiness just makes your mind and senses to work slowly, and instead of improving your vision, this can decrease it as blurred vision is also one of the effects of drowsiness.
