Many people believe that a slightly open window promotes better sleep. The fresh air seems to be soothing and create an immediate sense of well-being. However, many health experts recommend closing the window at night. This habit can present risks that are often underestimated.

Closing the window doesn’t mean sacrificing good air quality. There are other solutions to ensure restful sleep while protecting your health.

Risks to health and sleep quality

Sleeping with the window open exposes you directly to temperature fluctuations. These sudden changes can disrupt your sleep cycle. Your body reacts to every cold draft and struggles to maintain a stable temperature. As a result, your sleep becomes lighter and less restorative.

Outdoor air also carries allergens like pollen and dust. These particles can cause sneezing, irritation, and respiratory discomfort. For sensitive individuals, this can be enough to disrupt an entire night. Sleep experts recommend limiting this exposure, especially in spring and fall.

Noise pollution is another problem. An open window lets outside noise in. A passing car, a loud voice, or a siren are enough to disrupt the rhythm of sleep. Even a simple nighttime awakening can affect the overall quality of sleep and increase fatigue upon waking .

Some people sleep more soundly when they feel safe. An open window can cause psychological discomfort. This sensation, even if slight, affects relaxation and delays falling asleep.