This week has seen some of the highest temperatures ever-recorded across the UK.
Despite thunderstorms, night-time values have rocketed and it's easy to be tempted to sleep beside a fan to keep cool.
But you shouldn't, because sleeping with a fan on at night is actually bad for your health.
Apparently, the breeze apparently helping you is actually circulating all the dust and pollen in the room, ChronicleLive reports.
Worryingly, this can a build up in your sinuses and potentially triggering asthma or similar allergies.
Plus, the blast of cooler air can dry up your skin - not to mention your throat, and even your eyes.
Apparently, it can even cause sinus irritation.
This may impact your nose and airways, causing extra mucus to build, not to mention stuffiness and headaches.
Fans can also make you ache all over when you wake, by causing your muscles to cramp up overnight.
Instead, Brits are being advised to consider keeping one room shaded during the day and to drink cold water rather than caffeine or alcohol to decrease core body temperature.
Other tips to consider to help get a good nights sleep include sleeping on cotton sheets, having a lukewarm shower before bed and wearing loose clothing.
Freezing a handful of water bottles that contain a pinch of salt inside and putting them on a tray in front of a fan will help create a cool breeze as the air blows over them.
