Many people open their windows at night to enjoy fresh air, but experts caution that this habit can disrupt sleep. Sudden drops in temperature cause the body to adjust repeatedly, preventing deep rest and leaving sleepers feeling tired or achy.

An open window also allows allergens, dust, and pollutants to enter, which can irritate the respiratory system and disturb those with allergies or asthma.

To enjoy clean air safely, it’s better to ventilate your room before bed or use an air purifier. Balanced humidity, proper ventilation, and temperature control offer the benefits of fresh air without exposing your body to nighttime discomfort.