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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.
Simple alternatives for better sleep
Closing the window doesn’t mean sleeping in a stuffy room. A few simple steps can improve air circulation without exposing yourself to external hazards. Opening the window during the day remains an effective first solution. The air circulates, renews itself, and leaves the room cool for the night.
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