BRITS have been warned they should not sleep with ta fan on as the UK grapples with scorching temperatures amid a 34-degree heatwave.

As Brits enjoy sizzling heat and attention turns to sleeping, many will opt for a bedside fan to help drift off in boiling temperatures.

However, experts have warned keeping a fan on overnight can have a negative impact on your health, particularly if you suffer from allergies and/or asthma.

Sleeping with a fan on could end up circulating pollen and dust into the albeit cooler air.

One expert explained how “concentrated cool air can make muscles tense up and cramp”. It can also dry up your nasal passages which could result in your body producing more mucous and leave you feeling blocked up when you wake up.

Experts have warned to take a close look at your fan. If it’s been collecting dust on the blades then that dust will be circulating overnight.

But in more positive new for those who struggle to sleep at night in hot temperatures, the Met Office predicts the sizzling temperatures won’t last too long.

The Met Office said: “A cold front from the north introduces more uncertainty on how long the highest temperatures will hang on for Saturday, with areas to the southeast currently most likely to hold on to warmth the longest, although the extent of this is still being determined.”