The UK is sweltering through another heatwave, and millions of people are tossing and turning, unable to get a good night's sleep. Hot weather can make you feel tired and lethargic during the day because your body is using more energy to regulate its internal temperature. But when night comes, the heat can keep you awake, leaving you exhausted and irritable. Why does this happen, and what can you actually do about it?
Sleeping in hot weather is difficult for biological reasons. Your body needs to cool down slightly to fall asleep, but when the ambient temperature remains high, that natural drop doesn't occur. The UK's recent heatwaves – including a June 2026 spell that threatened to break records for the hottest day and night ever recorded in the month – have made this problem acute. The Met Office warned of a "heat-dome" settling over western Europe, bringing temperatures up to 40°C in parts of England and Wales, close to the UK's all-time high of 40.3°C set in July 2022. Such conditions aren't just uncomfortable; they can be dangerous, with red weather warnings issued, schools closed, and transport bosses advising against all but essential travel.
“Tips for sleeping in hot weather and why heat disrupts rest, explained for UK readers.”
The key to sleeping better is managing your environment and habits. Keep your bedroom cool by closing curtains or blinds during the day to block out the sun, and shut windows on the sunny side of your home to keep hot air out. Then, just before bed, open all windows to create a through breeze. Use thin cotton sheets, which absorb sweat, and wear loose-fitting clothes made of natural fibres like cotton or linen – contrary to popular belief, sleeping naked isn't always cooler because natural fabrics help wick moisture away. A fan can help: it encourages evaporation of sweat and helps your body regulate its temperature. If you don't have a fan, try filling a hot water bottle with ice-cold liquid or cooling socks in the fridge and putting them on, as cooling your feet lowers your overall skin temperature.
Stay hydrated by drinking water throughout the day, but avoid very large amounts just before bed – you don't want to wake up thirsty, but you also don't want an extra trip to the bathroom. Be careful with soft drinks, which often contain caffeine and stimulate your central nervous system. Alcohol is also a trap: it might help you fall asleep, but it promotes early morning waking and poorer sleep quality. Try to keep to your usual bedtime routine, and avoid napping during the day – if you feel sleepy in the heat, save that precious drowsiness for night-time.
For UK readers, this advice is increasingly important. Heatwaves are becoming more frequent and intense. The June 2026 heatwave saw lightning strikes cause a house fire in Bristol, and many homes are not built for such conditions. Knowing how to sleep in the heat isn't just a comfort issue – it's about staying healthy and safe.
Q: Why can't I sleep when it's hot? Your body needs to cool down to fall asleep, but hot weather prevents that natural temperature drop. You also use more energy to regulate your internal temperature, making you feel tired but unable to rest.
Q: Should I use a fan? Yes, a fan can be sensible – it encourages sweat evaporation and helps your body cool down. But if you don't have one, cool socks or an ice-filled hot water bottle can also work.
Q: Is it better to sleep naked in a heatwave? No. Loose-fitting clothes made of natural fibres like cotton or linen are better because they absorb sweat and help regulate temperature. Sleeping naked can actually make you feel hotter as sweat doesn't evaporate as efficiently.
What happens next? The UK's weather is likely to see further heatwaves, especially in summer. The Met Office's warnings and school closures show that officials are taking extreme heat seriously. Learning to cope – especially with sleep – will only become more important.