Amid the lighthearted debates of everyday life—milk before cereal or vice versa, toilet paper roll facing the wall or forward—there’s a much more serious, yet often overlooked, question: should you sleep with the door open or closed? A choice that may seem trivial, but it hides a real domestic security issue.
Sleeping with the door open: a reassuring reflex… wrongly
Many people sleep with their door ajar , or even completely open. Why? To hear noises in the house , to let the air through , or simply out of habit or a sense of security . This particularly affects parents of young children, or anxious people.
But according to firefighters and fire prevention specialists , this practice increases the risks in the event of a domestic fire.
In case of fire, smoke kills faster than flames
When a fire breaks out, it is not the flames that spread fastest , but the smoke and toxic gases such as carbon monoxide.
These elements quickly infiltrate , invade rooms and can become fatal within minutes.
A closed door acts as a shield , slowing the arrival of heat, smoke, and gases. This gives you precious time to react, alert emergency services, and evacuate.
Edifying tests conducted by specialists
The UL Firefighter Safety Research Institute , a U.S. fire safety research organization, conducted several full-scale tests. Their findings:
- In a room with a closed door , the temperature remains lower, the air is more breathable, and visibility is maintained longer.
- Conversely, in a room with an open door , the heat becomes unbearable and smoke invades the premises in less than 3 minutes.
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