Sleeping with the window open may seem like a healthy choice — fresh air, a cool breeze, and the soothing sounds of nature can make for a relaxing night. However, many experts caution that this seemingly harmless habit may come with hidden risks. Understanding the potential downsides can help you make an informed choice about your sleep environment.

1. Increased Exposure to Allergens and Pollution

While fresh air can be refreshing, it can also carry pollen, dust, mold spores, and air pollution into your bedroom.

Seasonal allergies: Pollen from trees, grasses, and flowers can trigger sneezing, itchy eyes, and nasal congestion.