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Sleeping with a fan on? An NHS GP says there’s one thing you should check first

Sleeping with a fan on? An NHS GP says there’s one thing you should check first

That steady bedroom whirr might help you drift off in the heat, but an NHS GP says it can come with a few unexpected downsides

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Ruairidh Pritchard

Published: May 26, 2026 at 12:52 PM

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When temperatures soared this week, bringing the hottest May night on record, many of us reached straight for the fan in a bid to get some much needed sleep.

But while that steady whirr might feel like a lifesaver in a stuffy bedroom, experts say it could be doing more harm than good, especially if your child struggles with asthma, eczema or hayfever.

Dr Hana Patel, NHS GP and resident sleep expert at Time4Sleep, has shared the pros and cons of sleeping with a fan on, plus her top tips for keeping cool without aggravating allergies.

Is sleeping with a fan on bad for you?

Dr Patel says it is not quite as simple as yes or no.

“Most obviously, a fan can help to keep you cool as you sleep during higher temperatures. A fan will not cause serious health issues, but some people may find that it can lead to them waking up with dry skin, congestion, agitated allergies, and even sore muscles. In this sense, it is not a misconception that fans can be bad for you, although any negative effects may be exaggerated.”

In other words, for many families it is a harmless way to cope with a heatwave. But if you or your child already battle allergies or sensitive skin, it is worth paying attention to how you feel in the morning.

The benefits of sleeping with a fan

Hot, restless nights are more than just irritating. Broken sleep can quickly affect mood, patience and mental wellbeing, something every parent knows too well.

“Fans help you to keep cool when you sleep. This is important, because if we get too hot when we sleep, it can lead to disrupted sleep, leaving us feeling groggy and tired in the morning. Consistent lack of sleep can lead to other negative health impacts, such as decreased appetite and a decline in your mental health.

“Fans can also help some people fall asleep. The consistent hum of the fan mimics white noise, which can provide a soothing background noise that helps some people drift off.”

For little ones who struggle to switch off, that white noise effect can be particularly helpful.

How fans can worsen allergies

If your household is already stocked with antihistamines and tissues, this is where things get tricky.

Dr Patel explains that fans can stir up more than just cool air.

Those who experience allergies, especially allergies to dust or hayfever, may find that their symptoms are agitated by sleeping with a fan.

Dr Hana Patel, NHS GP and resident sleep expert at Time4Sleep

“This is because the fan will circulate allergens around the room, increasing the likelihood of them being breathed in, or coming into contact with your skin. If you wake up with a sore throat, itching or sneezing, it’s likely that the fan has aggravated your allergies.”

She adds that although air circulation can be beneficial, it may inflame symptoms for allergy sufferers.

“Whilst air circulation as you sleep is a good thing, for those with allergies it can inflame symptoms, You’ll notice that old fans accumulate dust on their blades. This dust will be propelled around the room as soon as the fan is turned on, leading to it being inhaled as you sleep."

"Fans also distribute allergens from around the room, and even outside if you have a window open, increasing the likelihood of them being inhaled."

Dry skin, irritated eyes and sore muscles

Ever woken up feeling tight, dry or oddly achy after a night with the fan on? There is a reason for that.

“Fans circulate cold air to help cool an environment, and this cold air can cause our skin to dry out, or irritate the eyes as we sleep. This is similar in some respects to how we experience dry skin due to air circulation during a flight. The key is to moisturise before and after bed to prevent irritation."

She also notes that if the fan is positioned too close to you, the steady stream of cold air can cause muscles to tense overnight, leading to stiffness by morning.

Children with asthma, eczema or strong allergies may be particularly sensitive.

“If you experience asthma or have relatively strong allergies, it may be a good idea to avoid sleeping with a fan. You are likely to find that the fan will cause more issues than benefits, due to it inflaming your medical condition. This is especially the case for children who experience asthma, allergies or eczema, who are likely to be negatively affected by the use of a fan.”

5 ways to use a fan without worsening allergies

If ditching the fan entirely feels unrealistic during a heatwave, Dr Patel suggests these practical tweaks:

“Put the fan in the hallway with bedroom doors open. This allows the air to circulate between rooms without many of the negative effects of having a fan in the same room.
“Wipe down the fan blades prior to use. This will reduce the amount of dust circulated.
“Reduce the speed of the fan. This can help cut down on the amount of allergens circulated by the fan.
“Prioritise other cooling methods. If you have allergies, consider using a cooling mattress, dressing appropriately, or opening windows instead of opting for a fan. Cotton or linen bedsheets are also highly breathable, and help to reduce temperature.”
“Reduce allergens in the room. Make sure you keep on top of cleaning by dusting and hoovering regularly. It’s a good idea to keep the door shut during the day to prevent pets or allergens from entering. This will reduce the amount of allergens you are exposed to when you sleep.”

Are there better alternatives during allergy season?

For some families, the fan will cause little to no issues. But if you notice more sneezing, congestion or irritated skin, it may be time to switch things up.

“For some people, a fan will cause little to no negative effects. However, if you do find that you are suffering from any health issues that are likely caused by the fan, consider simple alternatives instead. Dress appropriately for the temperature, and consider passive cooling methods, like opening windows and doors to improve circulation. You could also invest in a cooling mattress as a more active solution.”

As with most sleep advice, it comes down to what works for you and your family. Staying cool is essential for quality rest, but comfort should not come at the cost of your child’s breathing or skin.

Authors

Ruairidh PritchardDigital Growth Lead

Ruairidh is the Digital Lead on MadeForMums. He works with a team of fantastically talented content creators and subject-matter experts on MadeForMums.