When the nights get hot and stuffy, turning on a fan can feel like a lifesaver. The gentle hum, the cool breeze—it all seems harmless. But while sleeping with a fan on overnight can help you stay comfortable, it may also have unexpected effects on your throat and respiratory health.
1. Dry Air Leads to a Dry Throat
Fans work by circulating air and evaporating sweat from your skin. However, this same airflow can also strip moisture from the air and from the tissues inside your nose and throat. As you breathe in this dry air for hours, the protective mucous membranes that line your respiratory tract start to lose moisture.
2. Increased Risk of Throat Irritation and Inflammation

When cool air blows directly on your face or neck throughout the night, it can lower the local temperature around your throat. The body responds by tightening blood vessels in the area, which reduces circulation and weakens your natural defenses.
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