All electrical appliances have a small risk of overheating and catching fire, though this can be especially dangerous when you’re asleep and at risk of smoke inhalation. Older, outdated floor fans are more hazardous than new and modern electric fans. Regardless of your fan’s age, you should still clean your fan blades of lint and dust as they are a fire hazard. If the fan’s motors overheat, it can potentially ignite any dust on your fan. Rather than leaving your floor fan on overnight, instead, use it on a timer for just long enough to cool you down and help you sleep.