Unfortunately, ceiling and table fans can both trigger asthma symptoms at night, especially if you also have your windows open, according to Bustle.

On its website, the Children’s Hospital of Philadelphia noted that electric fans and open windows can increase the pollen count in your room, which could lead to more asthma problems at night.

If installing a window-unit air conditioner is an option, the hospital cited that as the best solution because air conditioners actually filter dust and pollen out of your room. According to WebMD, asthma is an “inflammation of the air passages that results in a temporary narrowing of the airways that carry oxygen to the lungs. This results in asthma symptoms, including coughing, wheezing, shortness of breath, and chest tightness.”