The Perfect Sleep Temperature: Tips for a Restful Night’s Sleep

Have you ever considered how much our body temperature and the temperature of our environment can affect how well we sleep? Sleep is controlled by our natural circadian rhythm and the alternating cycles of light and darkness during the day.

Our body temperature is usually around 37 degrees Celsius, or 98.6 degrees Fahrenheit, and it can vary by about 2 degrees Fahrenheit during the night. Our core body temperature begins to drop about two hours before bedtime as the day comes to an end and we prepare for sleep.

What is the perfect temperature?

Warmer temperatures can interfere with this natural cooling process, causing us to toss and turn or wake up more frequently at night. So, what is the ideal temperature for a good night’s sleep?

The ideal sleeping temperature, regardless of season, is between 15.5-19.5 degrees Celsius (60-67 degrees Fahrenheit). When it comes to your bedroom, it is generally a good idea to keep it cooler than the rest of your house, especially for babies, who should sleep in a cooler room (between 16 and 20 degrees Celsius) to avoid overheating.

Now, let us look at how temperature affects your sleep quality. Our bodies cool themselves by redistributing heat from the core to the extremities, a process known as vasodilation. Because cold feet can disrupt this process, wearing socks to bed may help you fall asleep more easily.

Higher body temperatures are associated with a decrease in restorative REM and slow wave sleep, both crucial phases of the sleep cycle. During these phases, our bodies are less effective at regulating temperature, making us more susceptible to waking up from feeling too hot.

Lack of REM sleep can lead to grogginess and negatively impact the immune system, memory, and focus. This is particularly important to consider, especially in regions without widespread access to air conditioning, where summer nights can be uncomfortably warm.

It’s worth noting that globally, nighttime temperatures are rising faster than daytime temperatures due to the climate crisis, primarily driven by the excessive use of fossil fuels.

What Makes the Ideal Sleep Climate?

Everyone has different preferences when it comes to their ideal sleep climate. Some people are more sensitive to cold, while others tend to feel warmer. In Nordic countries, for instance, it’s common to bundle up babies and let them nap outdoors during the winter for their health.

Factors like CO2 levels, humidity, and air quality play crucial roles in sleep quality. Keeping a window open at night, even in colder climates, can improve ventilation and reduce CO2 levels, which are linked to better sleep.

Humidity matters too. High humidity combined with high temperatures can make it challenging to sleep, as sweat evaporates more slowly, delaying the body’s natural cooling process. On the other hand, low humidity in winter can cause throat and lung irritation, dry skin, and eye discomfort. A humidifier can help balance humidity levels for a more restful night’s sleep.

Cleaner air is another consideration. Allergies, asthma, and pollution can disrupt sleep by causing colds, coughs, and rhinitis. A HEPA filter can remove airborne particles, purifying the air and creating a healthier sleep environment.

Choosing Bedding and Mattresses for Comfort

To prepare for the summer months, consider making a few changes to your bedding and mattress. Some mattress materials can retain heat more than others. If you find yourself overheating at night, switching from a memory foam mattress to one designed for cooling may help.

Mattresses that promote airflow and incorporate cooling technology can reduce overheating and enhance overall comfort. For example, the Hybrid® Luxe mattress offers cloud-like, cooling support with features like titanium Aerocoil® springs for airflow, open cell graphite-infused Simbatex® foam to prevent overheating, and a breathable bamboo wool-infused layer for temperature and moisture control.

The Hybrid® mattress provides similar thermo-regulating technology with seven layers, including Aerocoil® springs and cooling Simbatex® foam, for cooler and more comfortable sleep.

For those on a budget, the Essential mattress still includes cooling Simba technology with a layer of Aerocoil® springs, cooling Simbatex® foam, and a breathable sleep surface for a cooler night’s rest.

To combat hot, sticky nights, Simba offers Stratos® heat control technology in their Hybrid® Duvet and Hybrid Stratos® Pillow, which uses advanced phase change technology to absorb body heat when you’re warm and release it when you’re cold. You can easily identify the cool side of the duvet or pillow thanks to the colour-coded blue piping.

With these tips and considerations, you can create an optimal sleep climate that suits your preferences and promotes restful, comfortable sleep, regardless of the season or your geographical location.