As temperatures drop across the UK, electric blankets are flying off the shelves. But while they’re brilliant for taking the chill off a cold bed, there are a few things worth knowing before you climb under one every night.
“We get asked about electric blankets all the time at this time of year,” says Judith Ackers, Bed and Mattress Expert at Land of Beds. “People want to know if electric blankets are safe to leave on overnight, whether they’ll ruin their mattress, and if they actually help you sleep better. The short answer is: it depends how you use them.”
Do electric blankets help or hinder sleep quality?
Used properly, a heated blanket can genuinely improve your sleep, especially if you’re someone who struggles to nod off in a freezing cold bed. Getting into a pre-warmed bed helps your body relax and signals that it’s time to wind down.
The problem comes when people leave them on all night at a high setting. Your body needs to cool down slightly to fall asleep in the first place, and staying cool helps you stay in deep sleep. If an electric blanket is keeping you too warm, you’re fighting against what your body’s trying to do naturally. That’s when you end up tossing and turning, waking up sweaty, or feeling groggy in the morning.
“If using a electric blanket, I would always recommend using an electric blanket to warm the bed before you get in, then switching it off or turning it down to the lowest heat setting once you’re settled,” Judith explains. “That way you get the benefit of the warmth without overheating during the night.”
Modern electric blankets often come with dual controls, which is handy if you share a bed with someone who runs hotter or colder than you. You can each set your side to different temperatures without compromising the other person’s comfort.
Why does temperature mess with sleep so much?
Your body’s internal thermostat is surprisingly fussy. When you’re too cold, your muscles tense up and your body diverts energy to keeping warm rather than letting you drift off. When you’re too hot, you struggle to fall asleep in the first place because your body can’t cool down the way it needs to. Even if you do drop off, excess heat means you wake up more often and get less of that proper deep, restorative sleep.
Research suggests the ideal bedroom temperature for sleep is between 16°C and 19°C. While a pre-warmed bed can help you feel comfortable and relaxed when you first get in, it’s the cool room temperature that does the real work in helping you fall and stay asleep.
“It sounds counterintuitive, but a cool room with warm bedding is the winning combination,” says Judith. “Pre-warming your sheets for comfort is fine, but your room itself needs to stay cool. Your body needs to drop its core temperature to fall asleep properly. That’s why so many people stick a leg out from under the duvet in the middle of the night; they’re instinctively trying to cool down.”
Are electric blankets safe to sleep with all night?
Modern electric blankets are much safer than older models, with built-in safety features like automatic timers and overheat protection. Most newer models also have an auto shut-off function that kicks in after a set period, which is reassuring if you’re worried about leaving it on by accident.
That said, most manufacturers recommend switching them off before you fall asleep, and there’s good reason for that. Leaving a heated blanket on all night increases the risk of overheating, dehydration, and in rare cases, burns or electrical faults. It’s also not great for anyone with certain health conditions like diabetes or circulation problems, as they may not notice if the blanket gets too hot.
“If you really want to keep it on overnight, make sure it’s on the absolute lowest heat setting and that it’s a newer model with proper safety features,” Judith advises. “But honestly, I’d just warm the bed for 20 minutes before you get in and switch it off. You’ll sleep better and it’s safer.”
When shopping for electric blankets, look for ones with multiple heat settings and overheat protection as standard. Sizes range from single up to super king, so make sure you’re buying one that fits your mattress properly.
Can electric blankets damage your mattress?
This is a common worry, and it’s not entirely unfounded. Electric blankets can potentially void your mattress warranty, especially if you have a memory foam or hybrid mattress. The heat can break down foam layers over time, affecting support and comfort.
“I’ve seen mattresses where people have used electric blankets on high settings for years, and you can actually see the impression where the blanket was,” Judith says. “Memory foam in particular doesn’t respond well to prolonged heat. If you’ve spent good money on a quality mattress, it’s worth being cautious.”
If you do use an electric blanket, always check your mattress warranty first. Some brands specifically exclude heat damage. An over-blanket (one that sits on top of you rather than under you) or a heated throw is a safer bet if you’re concerned about your mattress. Heated throws work particularly well if you just want to warm up on the sofa before bed without affecting your mattress at all.
Alternatives to electric blankets
If you’re not keen on electric blankets or want a more cost-effective option that doesn’t add to your electricity bill, there are plenty of other ways to stay warm at night without cranking up the heating.
Hot water bottles are a classic for a reason! Pop one in your bed 15 minutes before you get in and you’re sorted. Just make sure you use a cover to protect your skin. They’re also much cheaper to run than electric blankets, with running costs of just pennies compared to around 3-4p per hour for a typical electric blanket, and there’s no risk to your mattress.
Layering bedding works brilliantly too. A cotton sheet, a wool blanket, and a duvet gives you options to adjust throughout the night. Natural fibres like wool are particularly good at regulating temperature. Flannel or brushed cotton sheets feel warmer to the touch than standard cotton and make a noticeable difference on cold nights.
Bed socks might not be glamorous, but keeping your feet warm genuinely helps you fall asleep faster. Your extremities cool down first, so warm feet send a signal to your brain that it’s safe to sleep.
Heated throws are another option if you want the convenience of electric heating without the mattress concerns. You can use them on the sofa to warm up before bed, or drape one over your duvet for extra warmth without placing heat directly under your body.
“I’m a big fan of layering,” says Judith. “A good wool blanket between your sheet and duvet does the job just as well as an electric blanket, and you can kick it off if you get too warm. Plus there’s no electricity bill and no risk to your mattress.”
The bottom line
Electric blankets aren’t inherently bad for sleep, but they need to be used sensibly. Warm your bed before you get in, turn them off or down to a low heat setting overnight, and don’t use them on memory foam mattresses if you can help it. Look for models with safety features like overheat protection and auto shut-off, and if you share a bed, dual controls make life much easier.
According to Electrical Safety First, electric blankets are involved in around 5,000 house fires every year in the UK, with many incidents linked to older models or improper use. Replacing blankets over 10 years old and following manufacturer guidelines significantly reduces risks.
If you’re waking up hot and bothered or feeling more tired than usual, your bedroom temperature might be the culprit. A cooler room with the right bedding will always beat an overheated bedroom.
“Good sleep is about balance,” Judith says. “You want to feel cosy when you get into bed, but not like you’re sleeping in a sauna. Get that right and you’ll notice the difference almost immediately.”
Written by Judith Ackers
Judith brings her background in psychology, neuroscience, and education to her role at Land of Beds, where she shares expert advice to help customers sleep better. From product buying guides to bedtime routines and sleep-friendly habits, Judith’s insights support Land of Beds’ mission to improve sleep for everyone.