**Alcohol** has a significant impact on driving, and one of its effects is that **it can promote the onset of sleepiness**. This is because alcohol affects the brain, which can lead to decreased alertness and increased drowsiness.

- The consumption of alcohol causes a **false sense of security** and can lead the driver to take more risks, increasing the likelihood of accidents.
- Additionally, alcohol affects the **ability to properly see the surroundings**, which includes poorer perception of traffic signs and greater difficulty in judging distances.
- There is also a **difficulty in coordinating movements** and a need for more time to react, which can contribute to fatigue and sleepiness.

In summary, alcohol not only affects reaction time and perception of the environment, but it can also induce drowsiness, making it extremely dangerous to drive under its influence.