"Thing two - do not be lying on your back and certainly not on your stomach, where more heat is going to be sucked in between the mattress and the body.More surface area is filled, sidelying would be the best option...

"And finally guys, do not be buying memory foam. A - it absorbs body heat and b, because it's so soft like a bowl of porridge it's muc more difficult to move and turn in. And then you're going to have to toss and turn through the night, increasing heart rate, making you super duper hot."

Surprisingly, avoiding sugary drinks, coffee and even alcohol may help as well, as McMillan claims they often leave you dehydrated.

She said: "It may seem like obvious advice to give, but stay hydrated. Even if you’re not thirsty it is important to drink plenty of water as hot weather causes you to sweat, and it’s vital to replenish the lost fluids or you’ll overheat.

"Have a water bottle within reach as you go about your day to avoid dehydration. Alcohol can reduce the amount of sweat we produce, therefore making it harder for the body to cool down which can cause your body temperature to rise to extremely dangerous levels."