Warm weather has finally returned, and many people in the UK are getting ready for higher temperatures in the coming days. With forecasts showing heat in the mid-20s, a fan often feels like the easiest way to stay cool. But sleep experts say running one all night may not work well for everyone.

According to Sleep Advisor, constant airflow can dry out the nose, throat, and eyes. When the air becomes too dry, the body may produce extra mucus to protect itself, which can lead to blocked sinuses and headaches. The same dry air can also irritate sensitive skin.

Some people may even wake up with stiff or sore muscles. Cool air blowing in one direction can make the body tense up without realizing it. This is less common, but it can happen if the fan is close to the bed or pointed directly at the face.

There are benefits too. Fans help move stale air around the room and can lower body temperature enough to make falling asleep easier. They also create a steady sound that helps drown out outside noise, which can be useful in busy areas.

Experts suggest paying attention to how your body reacts. If you notice dry skin, irritated eyes, or allergy symptoms, it may be better to avoid running the fan all night. A rotating fan or one with a built-in timer can offer a gentler option. Upgrading an older fan may also help, especially if dust and pollen have built up inside.

Sleeping with a fan isn’t dangerous, but some people may feel the drawbacks more than the benefits. Adjusting your setup—or using the fan only at certain times—can help you stay cool without discomfort.