**Drowsiness** is a state in which one feels tired and heavy, and it can affect driving even before falling completely asleep. The **first symptoms of drowsiness** are already dangerous and can cause accidents.

- **Symptoms of drowsiness**: Include difficulty keeping the head upright, blurred vision, frequent yawning, loss of concentration, being easily distracted, and difficulty remembering the last few kilometers driven. It can also lead to drifting out of the lane, not paying attention to traffic signs, and driving too close to the vehicle in front.

- **Causes of drowsiness**: Sleeping less than usual, changing sleep schedules, poor sleep, driving on roads with little traffic, consuming alcohol or medications, and driving at critical times such as early morning or after eating.

Therefore, it is important to recognize these symptoms and take measures to avoid driving in a state of drowsiness, as they can affect reaction capacity and increase the risk of accidents.