To avoid drowsiness while driving, it is essential to sleep **enough hours to be well-rested**. This is because **drowsiness** is a state in which one feels tired and heavy, which can affect the ability to drive safely.

- Sleeping fewer hours than usual or changing sleep hours can cause drowsiness. Even if you sleep many hours, if the quality of sleep is poor, you can also experience drowsiness.
- Driving while drowsy is dangerous, as many traffic accidents are related to this state. It is not necessary to fall completely asleep for the risk of an accident to increase; symptoms of drowsiness can appear before falling completely asleep.

Therefore, it is crucial to ensure you sleep enough to be well-rested and avoid these risks at the wheel.