**Drowsiness** at the wheel can significantly affect a person's driving ability. When a driver is drowsy, they experience a **difficulty in making decisions** and may take longer to react to situations on the road. This is because the state of drowsiness causes a feeling of **tiredness and heaviness in the body**, which affects the driver's responsiveness and judgment.

Additionally, drowsiness can lead the driver to **accept a higher level of risk**. This happens because, when drowsy, the driver may not adequately assess dangers or may underestimate risky situations, increasing the likelihood of making reckless or dangerous decisions on the road.

Therefore, it is crucial that drivers avoid driving when they are drowsy to reduce the risk of accidents and maintain road safety.