When summer temperatures remain high long after sunset, getting a good night's sleep can feel like a challenge.
Many people look for simple ways to cool down their bedrooms, and opening a window before bed is often the first solution that comes to mind. It feels natural, costs nothing and seems like an easy way to let fresh air circulate through the home, reports Dagens.
However, experts cited by Belgian media outlet Bien say the popular habit may not always deliver the benefits people expect. While cooler nighttime temperatures can make a room feel more comfortable, other factors may quietly affect the indoor environment.
The hidden role of humidity
One of the biggest concerns is moisture. Although the air outside feels cooler after dark, it often contains higher levels of humidity. When windows remain open for hours, that moisture can gradually enter the home.
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Over time, increased indoor humidity can create conditions that encourage mould growth and dust mites. These issues may affect overall indoor air quality and can be particularly troublesome for people with allergies, asthma or other respiratory conditions.
Experts note that many homeowners focus on temperature alone and overlook the impact humidity can have on comfort and health.
More than fresh air
An open window does not only allow cooler air indoors. It can also provide an easy entry point for pollen, dust, insects and air pollution particles.
During the summer months, when pollen levels are often elevated, this can become a particular concern for allergy sufferers. Even in urban areas, traffic-related pollutants may enter the home overnight and affect air quality.
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Smarter ways to stay cool
Instead of leaving windows open throughout the night, specialists recommend shorter periods of ventilation during the coolest parts of the evening or early morning.
Fans can help improve air circulation, while air purifiers may reduce unwanted particles indoors.
Sleeping with an open window is not necessarily harmful, but experts say it is worth considering the potential impact on humidity and indoor air quality. In some cases, what feels like the easiest way to stay cool may create problems that are not immediately noticeable.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.