The Nightly Fan: Cooling Comfort With Allergy and Dryness Risks

Sleeping with a fan can help cool you, but concentrated airflow may aggravate allergies or asthma, dry nasal passages, and cause skin irritation or stiffness in the neck. To reduce risks, use oscillation or indirect airflow, keep the room and fan clean, maintain humidity around 30-50%, and consider saline nasal spray if you wake with dryness; overall, it’s unlikely to cause long-term harm.