Joe Harker
As much as the sweltering weather may have you wishing you could get a cool night's sleep by any means possible, you ought to be careful about sticking on the air-con overnight.
It's a tempting prospect to have the air conditioning on, but a Brit who ended up in hospital after sleeping with it on while on holiday has issued a warning to others lest they make her mistake.
24-year-old Liana Foster was on her family holiday in Turkey when she woke up with a sore throat, the next day she woke up feeling 'groggy' and her mum spotted some white spots on the tonsils.
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A trip to hospital had Liana diagnosed with tonsillitis, and doctors said the most likely culprit for her malady was the air-con.
She spent five hours of what ought to have been precious holiday time on an IV drip and has been on medication since then.
"I felt really groggy and got a sore throat as well," the 24-year-old London scientist said of the early warning signs of tonsillitis.
"I was really shaky. I couldn't eat or drink. I thought it was covid again. My temperature was bad, my body was aching.
"I went to hospital and they said I have a really bad case of tonsillitis. They said it can happen from the aircon. It's been pretty dull for the last few days of holiday."
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Liana explained that on the first night of their holiday they had the air conditioning on 'really low in the room' and she thinks she sleeps 'through my mouth more'.
Air conditioning really can circulate poor quality air around a room and spread sickness, so be warned.
According to her doctors who said the aircon had been a likely culprit for her tonsillitis, they told her that 'mouldy air' might have been circulated around as she slept.
Liana said: "I couldn't consume oral antibiotics so I had to get injections for three days and twice a day.
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"I was in a lot of pain. I believe if we didn't sleep with the aircon on it would have been fine.
"I've had tonsillitis before but it has never been that bad. If bacteria travels down the throat it can get to her heart and other organs."
So be warned if you're planning on sticking the aircon on overnight,
If you're trying to keep cool while asleep then you might want to be careful about sticking a fan on as well, as that carries some health problems as well.
Your best bet is to keep the bedroom cool before you sleep in it, so close the curtains to block out baking hot sunlight and keep the windows shut during the day to prevent hot air from getting in.