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Often find yourself turning into a human furnace at night unable to cool yourself down?

You’re not alone.

A woman with an afro sleeping on her side covered in grey duvet while she sweats in her sleep, thinking of a cooling mattress.

According toGallup News, 57% of Americans are too hot to sleep at least occasionally.

Hence, it’s easy to see how running hot at night can cause sleep disruption.

Woman wearing a pink vest top with her hand on her forehead as she wakes up with night sweats.

7 reasons you get hot when you sleep

There is no single cause of nighttime hot flushes.

Many physiological, hormonal and environmental conditions, along with lifestyle choices, can make you sleep hot.

Dr. Rosen explains bedding and sleepwear made from synthetic fibers andmemory foam mattressestrap heat, making you too warm.

A man wearing a grey tshirt sitting on bed of bed in beige room with his head in his hands as he struggles with anxiety and depression and sleep.

Dr. David Rosen trained in sleep medicine at JFK Medical Center in Edison, New Jersey and is board-certified.

This committee helps lobby government officials to promote national policy initiatives that benefit the sleep of all Americans.

Alongside these roles, Dr. Rosen regularly lectures to the general public on sleep medicine topics.

Sleep deprivation

Hormonal changes

Hormones have the upper hand over many bodily functions including sleep and temperature regulation.

Thefluctuating and declining estrogenlevels during this phase in a womans life impact the body’s temperature regulation system.

In turn, women become more sensitive to slight climate changes, often feeling sudden sensations of heat.

Women in white top having trouble sleeping

Hormone changes (again fluctuating estrogen levels) also happen during pregnancy to support fetal development.

In the same way as menopause, this can induce hot, uncomfortable nights.

Finally, hormones shift constantly throughoutwomen’s cycles.

Eight Sleep Pod 4 smart mattress cover on bed with beige bed base and two white pillows against a wooden panelled wall.

Here’s why:

4.

Which medications does this apply to?

Dr. Rosen listantidepressants, steroids, hormone therapies and some painkillers as potential causes of body temperature rises.

A woman sat on bed wearing white vest and orange shorts with a glass of water in hand, looking out of window with wooden frame and plants outside.

Therefore, hitting the gym is not recommended immediately before hitting the hay.

“Exercise regularlybut finish at least 3 hours before bedtime,” Dr. Rosen says.

Food and drink choices

Eating large or calorie-dense meals close to bedtime can lead to heatwaves at night.

A woman with long dark curly hair and pink pyjamas sitting in bed reading a book

This is because the increased metabolic activity required for digestion raises body temperature and can disrupt sleep.

You should also pay attention to the afternoon andbedtime snacksand beverages you consume.

Researchshows spicy foods particularly elevate body temperature during the first sleep cycles.

Young woman is wide awake at night and wants to fall back to sleep fast

Consuming these foods in the evening shouldn’t be an issue if it happens occasionally.

Again, this rises core temperature, making it more difficult to bag quality shut eye.

What’s it like to sleep hot?

A woman with dark curly hair holds her hand to her forehead in frustration because she cannot sleep at night due to too much light coming in her bedroom window

In short, sleeping hot is no fun.

This discomfort makes it harder to nod off.

Despite being bothersome, hot flushes can sabotage sleep quality by disruptingsleep cyclesand decreasing time spent asleep.

The image shows the DreamCloud Hybrid Mattress on a grey bed foundation in a neutrally decorated bedroom

This can lead tosigns of sleep deprivationlike reduced productivity, physical fatigue and difficulty concentrating.

Many mattresses nowadays have specialized cooling technology like foams infused with high thermal conductivity elements or cool-to-touch covers.

Thebest smart bedseven have dual control climate systems that keep you at an optimal sleep temperature all night long.

A woman sleeping comfortably and cooly on her side over the top of duvets

It is worth investing in these beds if you’re really struggling to beat the heat at night.

So, a bed with more bodies tends to be warmer.

Temperature can cause arguments in the bedroom.

The Eight Sleep Pod 4 on a mattress in a bedroom with the Pod 4 hub next to the bed

Arecent study by Naturepedicfound 39% of couples sleep separately because they prefer different temperatures.

If you and your partner are struggling to find a compromise, a sleep divorce may be in order.

Sleeping separately can help you cool down and stop your nighttime hot flushes affecting your partner’s sleep quality.

A sleep week badge in the corner of a picture that depicts a woman smiling as she is getting more sleep.

One well-rested partner is better than none, right?

At least they’ll have energy for the household chores.

Keep hydrated through the day

Sweating is your body’s way of cooling itself down.

The image shows a sleep deprived woman lying in bed and holding her hands over her eyes

But to produce sweat (and release heat) your body needs ample water.

Hence, staying hydrated throughout the day can improve overall temp regulation, helping you sleep peacefully at night.

Timing your hydration is key.

A chocolate Easter egg in pink tin foil next to image of blonde woman in purple star patterned pyjamas struggling to sleep in bed with white sheets

So drinking smaller quantities of water more consistently through the day is better for hydration levels and sleep quality.

Vasodilation is when muscles relax and blood vessels widen, enhancing circulation throughout the body.

Astudypublished in the American Journal of Physiology provides evidence that this thermoregulatory process promotes readiness for sleep.

Woman lying down on the bed and smiling feeling comfortable

However, Dr. Rosen warns this bath (or shower) should be lukewarm rather than hot.

Getting good quality sleep is all about regulating your natural sleep-wake cycle, aka thecircadian rhythm.

Maintaining a consistent, relaxingnighttime routinehelps your body recognise when it is time to prepare for sleep.

A woman lying on her side sleeping with a handdrawn thought bubble over her head to show she�s thinking

In turn, your body avoids the fight or flight response known to induce hot flushes.

When should I be worried about sleeping hot?

Sleeping hot occasionally isnt anything to worry about.

A woman with dark brown hair lies on her side staring at the back of a white alarm clock that shows the time as 2.30am

A woman with short brown hair sitting on bed with white sheets with a glass of green Spirulina smoothie in hand

A woman with brown hair lies on her stomach on a grey colour Japanese floor mattress

A mattress we tested is dressed with neutral colour bed linens and pillows

Casper Wave Hybrid Snow review: woman lying on the mattress on her side, with her head on a pillow

Woman smiling while she sleeps with headphones in and her arms overhead

A person wearing rubber gloves uses a spray bottle and a clean cloth to clean the surface of the Emma Elite mattress.

Galaxy S25 Plus held in the hand.