Drivers who suffer from **insomnia** may experience **drowsiness**, which affects their ability to drive safely. Drowsiness is characterized by a feeling of **tiredness** and **heaviness in the body**, and it can lead drivers to perform some movements **automatically** without being fully aware of their actions.

- **Symptoms of drowsiness** include difficulty keeping the head upright, blurred vision, and loss of concentration. These symptoms can cause the driver to miss traffic signals or drift out of their lane, increasing the risk of accidents.

- Driving while drowsy is dangerous because drivers can be easily distracted and may not remember the last few kilometers driven, indicating that they are operating the vehicle automatically and without full attention.

Therefore, drivers with insomnia are more dangerous on the road due to these automatic effects and lack of attention, which can lead to risky situations.