**Drowsiness** is a state in which a person feels **tired** and **heavy in the body**, which can affect their ability to drive safely. Even if one does not fall completely asleep, the symptoms of drowsiness can appear and affect driving.

- One of the main effects of drowsiness is that the driver **takes longer than usual to react**. This means that, in a situation requiring a quick response, the drowsy driver will not be able to react as quickly as they would under normal conditions.

- Additionally, drowsiness causes **difficulty in making decisions** and can make body movements slower. In extreme cases, the driver may even fall asleep for a few seconds without realizing it, which is extremely dangerous.

- Drowsiness can be caused by several factors, such as **sleeping fewer hours than usual**, **changing sleep hours**, **sleeping poorly**, or **driving at times of the day when the body is more predisposed to sleep**, such as early morning or after eating.

Therefore, a driver under the effects of drowsiness **will take longer to react**, increasing the risk of accidents.