**Fatigue** and **drowsiness** are states that can severely affect the ability to drive safely. Both can appear suddenly and have symptoms indicating that it is necessary to stop and rest.

- **Fatigue**: It manifests with difficulty concentrating, heavy eyes, slow movements, and a feeling of nervousness and irritability. These symptoms can cause the driver to take longer to react and make incorrect decisions at the wheel.

- **Drowsiness**: It is characterized by difficulty keeping the eyes open, blurred vision, frequent yawning, and loss of concentration. It can also lead the driver to become easily distracted and not pay attention to traffic signs.

Since **sleep can appear at any moment**, it is crucial to be aware of these symptoms and stop in a safe place to rest. Ignoring these signs can increase the risk of accidents, as the driver may fall asleep at the wheel without warning.