A doctor has issued a warning to those who keep their heating on overnight.
Dr Karan Rajan says keeping your room cooler as you sleep could have a number of health benefits, Birmingham Live reports.
He said: "Not only does melatonin increase sleep propensity, it's also a hormone that promotes anti ageing.
"It reduces oxidative stress damage and the levels of cortisol, it reduces systemic inflammation and it's free."
His advice comes as temperatures plummet across the country, with households cranking up the radiators as winter rolls in.
He added: "Our body's core temperature needs to drop to initiate sleep.
"So a cooler temperature gets you closer to the target sleep temperature of your body, so you fall asleep a lot faster."
Dr Rajan said: "Warmer temperatures means your brain and body are more active trying to cool you down.
"This increased brain activity limits the amount of REM and slow wave sleep your body needs to recharge".
He said: "There is research to suggest that cold exposure can increase the amount of brown fat produced by stem cells.
"Brown fat helps to regulate cholesterol, blood glucose and improves insulin sensitivity".
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