As Britain swelters through an intense early summer heatwave, experts are warning people against leaving electric fans running overnight, saying the popular cooling method could increase the risk of electrical fires, allergies and dehydration.The warning comes as the UK records unusually high overnight temperatures, with parts of southern England experiencing a “tropical night” after temperatures stayed above 21C. With homes becoming hot and stuffy, many people are turning to pedestal and desk fans to get through sleepless nights.However, appliance repair experts say fans should not be left running while people sleep. According to specialists, electrical appliances can overheat during extreme temperatures, raising the possibility of faults and even fires if left unattended overnight.According to The Mirror, experts are also advising households to check smoke alarms to ensure they are working properly during the heatwave.Health experts have also highlighted several side effects linked to sleeping with fans on continuously.One major concern is that fans circulate dust, pollen and other allergens throughout the room. This can trigger sneezing, itchy eyes, congestion and breathing difficulties, especially for people with asthma, hay fever or allergies.Experts noted that dirty fan blades can worsen the problem by blowing accumulated dust directly into the air all night.Doctors also warned that constant airflow can dry out the skin, eyes, mouth and nasal passages. This may lead to sore throats, sinus irritation, nosebleeds and dehydration by morning. In some cases, the body responds by producing excess mucus, causing blocked noses and headaches.Another issue is muscle stiffness. Sleep specialists say exposure to cool air for long periods can make muscles tense up overnight, leaving people with neck, shoulder or back pain after waking up.Instead of keeping fans on all night, experts recommend using lightweight cotton bedding, staying hydrated, opening windows for airflow and taking cool showers before bed. Sleeping downstairs, where temperatures are naturally cooler, may also help during extremely hot nights.
