People are learning about the risks of leaving a car setting on for too long. Forgetting to turn it off can make you very tired while driving.

Many cars have an air recirculation button that keeps the air inside the car. It helps to cool the car quickly and save fuel.

Leaving this setting on for 20-30 minutes can be bad for you. It reduces oxygen and increases carbon dioxide, which can make you sleepy.

A TV presenter learned about this risk on TikTok. She said it was the reason she felt tired while driving.

The presenter often felt tired on long car journeys. She realized it was because of the recirculation button.

The radio host explained how the recirculation button works. It saves energy but can cause drowsiness if left on.

The host was skeptical but tried turning off the button. She didn't feel tired on her next long car journey.

The presenter turned off the button and felt better. She did a long journey without feeling tired.

The recirculation button can cause tiredness.

People like the recirculation button in extreme weather. But it can make you tired if you don't let in fresh air.

A doctor said drivers should not leave the recirculation button on for more than 20 minutes. Fresh air is essential for safe driving.

A study found that the recirculation setting can cause high carbon dioxide levels in cars. This can be bad for you on long journeys.