What is the ideal bedroom temperature?

Good sleep doesn't just start with a good mattress or a regular sleep schedule. The temperature in your bedroom also plays a major role. Yet, many people unknowingly sleep in a room that is too warm or too cold. Especially in summer, warm nights can lead to restless sleep, while some people struggle to stay comfortably warm in winter.

The ideal bedroom temperature helps your body fall asleep more easily and sleep more deeply. But how cold should a bedroom actually be? And why do partners often experience large temperature differences? In this article, you will read what science says, what helps and what doesn't, and how to make your bedroom more pleasant for a better night's rest.

What is the ideal bedroom temperature?

The ideal bedroom temperature for adults is usually between 16 and 18 degrees Celsius. This is often considered the best temperature for sleep, as it helps your body cool down and relax more easily.

During sleep, your body temperature naturally drops slightly. This is an important part of your biological clock. A cool bedroom supports this process and helps you fall asleep faster.

Sleeping too warm, on the other hand, often leads to:

• restless tossing and turning
• waking up more often
• sweating during the night
• less deep sleep
• waking up tired

However, there is no perfect temperature for everyone. Age, body type, hormones, duvets, and personal preferences all play a role. That's why some people feel comfortable at 17 degrees, while a partner prefers 20 degrees.

How does temperature affect sleep?

Your body uses temperature as a kind of internal sleep signal. In the evening, your brain produces melatonin, the hormone that helps with drowsiness. At the same time, your core temperature slowly drops.

A cool bedroom supports this natural process. This allows your body to relax more easily and switch to sleep.

In a warm bedroom, the opposite happens:

• your body retains heat
• your heart rate remains slightly higher
• you sweat more
• deep sleep is more easily disturbed

Especially during warm summer nights, many people notice this directly. You find it harder to fall asleep and wake up more often without a clear reason.

Air quality also plays a role. A poorly ventilated bedroom feels stuffy more quickly. As a result, a room of 20 degrees can feel warmer than the thermometer indicates.

In our knowledge base on sleep science, you can read more about how sleep cycles and environment are related.

Why do couples experience temperature so differently?

Many couples recognize this problem: one prefers to sleep under a thick duvet, while the other wants to open the window.

This difference is normal. Temperature perception varies per person due to:

• metabolism
• hormones
• body weight
• blood circulation
• stress level
• preference and acclimatization

On average, women experience cold more intensely than men. During warm periods, some people may be more sensitive to heat and night sweats.

This often leads to discussions about:

• open or closed window
• thick or thin blankets
• fan on or off
• heating in winter

A practical solution is to work with layers:

• separate duvets
• breathable materials
• ventilation without drafts
• different sleepwear

This way, the entire bedroom doesn't have to have the exact same temperature for both partners.

What helps for a better sleep temperature?

Many small adjustments can make a big difference. Often, you don't need to make the bedroom extremely cold to sleep better.

Ventilate the bedroom well

Fresh air helps dissipate heat and moisture. Open windows briefly during the day and ventilate extra in the evening.

In summer, it helps to:

• keep curtains closed during the day
• ventilate late in the evening
• switch off heat sources

Think of televisions, chargers, and bright lighting.

Choose breathable materials

Synthetic fabrics often retain heat. Materials such as cotton, linen, and bamboo breathe better.

This applies to:

• bedding
• pajamas
• mattress covers
• pillowcases

People who sleep warm often notice an immediate difference.

Use layers instead of one thick duvet

A duvet that is too warm quickly leads to night sweats. It's better to work with multiple thin layers that you can easily adjust.

For couples, separate duvets can work surprisingly well. This way, no one has to compromise on comfort.

Pay attention to humidity

A humid bedroom feels warmer. Especially in summer, this can feel stuffy.

A humidity level between approximately 40% and 60% usually feels most comfortable for sleep.

Ensure peace around bedtime

Your body cools down more easily when you relax. Intense exercise, alcohol, and heavy meals just before bed can disrupt this process.

A fixed evening routine helps your biological clock work better with your body temperature.

What works less well?

Not everything that is popular around sleep actually helps everyone. Some solutions seem pleasant, but unknowingly disrupt sleep.

An extremely cold bedroom

Many people think that "colder is always better." But an ice-cold room can actually create tension in the body.

As a result:

• your muscles contract
• you wake up faster
• you sleep less restfully

For most adults, 16 to 18 degrees is more comfortable than, for example, 12 degrees.

Sleeping with a strong fan on your face

A fan can help during warm nights, but direct air currents sometimes cause:

• dry eyes
• stiff muscles
• dry throat
• draft sensation

Indirect cooling often works better.

Very thick duvets in winter

Many people compensate for a cold bedroom with heavy, warm duvets. This actually leads to overheating during the night.

Your body then retains heat while it actually wants to cool down.

Using alcohol to fall asleep faster

Alcohol can make you drowsy, but it often disrupts deep sleep and body temperature later in the night. As a result, you sleep less restoratively.

Who is a cooler bedroom suitable for?

A cooler bedroom mainly helps people who:

• sleep warm easily
• sweat during the night
• sleep restlessly
• have trouble falling asleep
• wake up tired

Also, during warm summers, many people notice an immediate difference when the bedroom is better cooled and ventilated.

However, additional nuance is important.

When something warmer can be more pleasant

Some people are more sensitive to cold:

• elderly
• people with low blood pressure
• cold sleepers
• people with muscle or joint pain

For them, 18 to 20 degrees can feel more pleasant.

Ultimately, the most important thing remains sleep quality. If you wake up refreshed, you are usually close to a good temperature for your body.

Frequently asked questions about ideal bedroom temperature

How cold should a bedroom be to sleep well?

For most adults, the ideal bedroom temperature is between 16 and 18 degrees Celsius. This helps the body cool down more easily and sleep more deeply.

Is sleeping with the window open healthy?

This can be pleasant when it provides fresh air and ventilation. However, be aware of drafts, noise, and pollen. In busy or warm cities, controlled ventilation sometimes works better.

Why do I sleep worse in a warm bedroom?

Heat makes it harder for your body to cool down. As a result, you sleep more restlessly and wake up more often during the night.

What is the best temperature for sleep in summer?

During warm summer nights, it is wise to keep the bedroom as cool as possible without extreme cold or strong drafts. Good ventilation and breathable materials often help more than just air conditioning.

Is 21 degrees too warm to sleep?

For many people, yes. At higher temperatures, the chance of sweating, tossing and turning, and restless sleep increases. However, this varies per person.

Does a cold bedroom help against snoring?

A cooler bedroom can feel more pleasant and improve sleep quality, but snoring usually has multiple causes such as posture, nasal breathing, or relaxation of the throat muscles.

Within our anti-snoring products you will find more information about aids for breathing and sleep comfort.

Conclusion

The ideal bedroom temperature for most people is between 16 and 18 degrees Celsius. This helps your body cool down more easily and sleep better. However, sleep remains personal. Some people sleep more comfortably in a slightly warmer room, while others need fresh air to rest well.

More important than an exact number is how refreshed you wake up. Small adjustments such as ventilation, breathable materials, and a suitable duvet often make a big difference.

Good sleep ultimately revolves around comfort, rest, and an environment where your body can relax.