Doctors are highlighting the mixed effects of sleeping with a fan on, especially during hot nights when people look for quick relief. A fan can make a bedroom feel cooler and more comfortable, which may help some people settle down to sleep more easily.
But the medical advice is not entirely positive. According to the report, too much concentrated airflow can irritate allergies, making fan use less helpful for people who are already sensitive to airborne triggers. That means the same overnight cooling that feels soothing to one person may cause discomfort for another.
The issue appears to come down to how direct and constant the airflow is, rather than fans being universally harmful. People with allergy symptoms may notice that strong air blowing in one place for hours can aggravate irritation during the night or by the time they wake up.
Overall, doctors are presenting sleeping with a fan on as a balance between comfort and sensitivity. It may offer welcome relief from heat, but those prone to allergies may need to be careful about how much direct air they are exposed to while sleeping.
