Doctors share what sleeping with a fan on does to your body and health - The Independent

What the report says

The Independent reported on health advice about sleeping with an electric fan during hot summer nights, noting that while fans can make humid rooms feel more bearable, a steady stream of air may also cause irritation for some sleepers. The article says doctors and medically reviewed health sources identified several possible side effects, especially when a fan is aimed directly at the face or body for hours.

According to the report, fans can circulate dust, pollen and pet dander, which may aggravate allergies, hay fever or asthma. The article cites Dr. William Lu of digital sleep clinic Dreem Health as saying that dry air combined with airborne allergens can worsen symptoms such as coughing, wheezing or congestion in people with sensitive airways. It also notes that dust on fan blades can add to what is blown around the room.

The article also describes other discomforts linked to prolonged airflow, including stiff or cramped muscles, nasal and throat dryness, excess mucus production, congestion, dry skin and irritated eyes. It cites ENT specialist Dr. Julius Goh on the importance of moisture for the nasal passages’ natural clearance system, and references medically reviewed articles from Healthline and Verywell Health for related effects such as neck stiffness and dry skin.

The guidance reported by The Independent is not that fans are dangerous, but that they should be used carefully. Suggested precautions include placing the fan at a distance, using an oscillating setting, avoiding direct airflow toward the head, cleaning fan blades, reducing dust in the room, replacing HVAC filters and keeping indoor humidity around 30% to 50%. The article adds that fans do not cool air itself; they help people feel cooler by moving air across the skin and aiding sweat evaporation.