I’m a sleep expert & it’s bad for your health to snooze with a fan on – how to keep cool as temperatures hit 29c

THE hottest day of the year is set to hit soon - and we bet you're sleeping with the fan on (or at least thinking about it).

But it turns out sleeping with one could actually be bad for you.

According to Mark Reddick, writing on , using fans can trigger allergies.

They are also bad for people who suffer from asthma.

Mark said: "For some people, having a ceiling or floor fan in the room helps them fall asleep and stay cool during the night.

"For others, it can keep them awake, trigger asthma attacks or dry out their eyes."

He also warned fans can cause dust to move around a room.

"As a fan moves air around the room, it causes flurries of dust and pollen to make their way into your sinuses," he explained. "If you’re prone to allergies, asthma, and hay fever, this could stir up a whole lot of trouble.

Mark recommended people clean their fans before they use them. He said: "If it’s been collecting dust on the blades, those particles are flying through the air every time you turn it on.

People also risk dry skin by using fans. "A constant blast of air on your body may cause dry skin. Lotions and moisturisers will help prevent this, but if your skin is excessively dry, use caution and monitor your skin to make sure you’re not over drying it," he explained.