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.

Over time, this can make you more vulnerable to sore throats, hoarseness, or even mild infections. For people with allergies, asthma, or sinus issues, the irritation can be worse, as the air movement may stir up dust, pollen, or mold particles present in the room.

3. Fans Can Spread Dust and Germs

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