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Why Do I Get Hot When I Sleep: Reasons and Solutions

Why Do I Get Hot When I Sleep: Reasons and Solutions


Do you often toss and turn at night, feeling unbearably hot? In fact, many people face the same problem, but why do we feel so hot at night? It's not just because of the heat or heavy bedding, there are many other reasons. In this article, we'll delve into the various reasons why you feel blazing hot while you sleep and provide you with a scientific solution.


1. Reasons why you feel hot while sleeping

1.1 Temperature rise due to environmental factors


The first thing we usually consider is the room temperature. A warm, uncirculated environment affects our sleeping temperature. On a hot night, without proper ventilation or air-conditioning, the room temperature may rise to an uncomfortable level.


1.2 Unsuitable sleeping materials


The type of bedding and pillows you choose really matters. Certain materials, such as polyester and synthetic fibres, may store heat. Whereas more breathable materials, such as cotton and linen, can help regulate your body temperature and keep you cool at night.


1.3 Internal regulation of the body


When we go into deep sleep, the body begins to repair itself. This process requires energy, the use of which generates heat. Plus, the body's metabolic processes (such as digestion) also generate heat, which needs to be released into the external environment.


1.4 Lifestyle and eating habits


The food we eat and the drinks we drink may affect our body temperature at night. For example, the intake of caffeine or alcohol, and heavily spiced foods may cause a rise in body temperature. And exercise before bedtime, while it has its benefits, may also make you sweat and heat up.


1.5 Hormonal changes


Women are particularly vulnerable to this effect. Menstruation, pregnancy or menopause can all affect body temperature. This is why certain women are especially prone to feeling blazing hot at night during certain times of the year.


1.6 Some health conditions


The presence of certain health conditions or illnesses, such as an overactive thyroid or low blood sugar, may cause sweating or fever at night. If you often feel hot at night and can't find a clear reason for it, it is advisable to consult a doctor to see if there is an underlying health problem.


2. Sleep and body temperature: an indispensable double melody

2.1 The body's biological clock and temperature fluctuations


The body has a natural rhythm known as the "biological clock", which regulates many of our physiological functions, the most important of which are sleep and wakefulness. There is a close relationship between this rhythm and body temperature. Typically, our body temperature decreases in the evening when the sky begins to darken, which is when most people begin to feel sleepy. And by 4-5 a.m., even though we are still sleeping, our body temperature begins to gradually rise in preparation for the new day's activities.


2.2 Sleep Cycle and Temperature Regulation


As we enter deep sleep, especially the REM (rapid eye movement) stage, the body's ability to regulate temperature in the external environment is diminished. This is why we sometimes still feel cold on winter nights, even when covered with heavy blankets. And during the light sleep stage, the body's ability to regulate temperature is gradually restored.


2.3 Heat transfer and sleep quality


The body needs to dissipate excess heat during the night, which is why you sometimes wake up on a hot summer night to find yourself drenched in sweat. Effective heat transfer usually promotes better sleep because it helps the body maintain the right temperature.


2.4 Application in Practice


In order to promote a good night's sleep, it is vital to maintain the proper room temperature. Temperatures that are too high or too low can interrupt our sleep cycle and affect the length of deep sleep. Try adjusting your room temperature to find that 'just right' point, or consider using a breathable mattress and pyjamas so you can stay cool even on hot nights.


3. How to keep a cool sleep


Maintaining a cool sleep environment isn't just about comfort, it actually has a direct impact on the quality of deep sleep. A cool environment helps the body to quickly fall into deep sleep, bringing rest to the mind and body. To ensure a comfortable night's sleep night after night, we can do the following:


  1. Adjust the room temperature


The optimal room temperature for sleeping is usually 18-22 degrees Celsius. You can consider using an air conditioner, fan or other ventilation devices to achieve this ideal temperature. This way, your body will not wake up due to overheating.


  1. Choose appropriate bedding


Bedding, pillows and sheets should be made of breathable, moisture-wicking materials. For example, cotton or natural bamboo fibre sheets are better for hot nights than synthetic materials.


  1. Avoid eating spicy food or drinking alcohol before going to bed.


Spicy foods or alcohol can increase your body temperature and make you feel sick during sleep. Try to avoid these foods and drinks at dinner, or make sure you allow enough time for your body temperature to return to normal before bed.


  1. Keep your bedroom dry


An overly humid environment can cause your sheets and bedding to become damp. Make sure your room has enough ventilation and consider using a dehumidifier, especially on hot and humid nights.


  1. Take a cool shower


Taking a gentle shower before bed can help lower your body temperature. Also, the flow of water helps to relax tense muscles, helping you fall asleep more easily.


  1. Relax your mind and body


Try meditation, deep breathing, or gentle stretching exercises, all of which can help relax your body and reduce sweating, leaving you feeling cooler as you fall asleep.


4. Choose the right mattress to create an ideal sleeping environment

4.1 Understand the mattress material and choose the right type for you


Memory Foam Mattress: This type of mattress moulds to the shape of your body, relieving pressure at pressure points and providing even support.


Hybrid mattresses: Hybrid mattresses combine springs with memory foam or latex to provide support and softness at the same time.


Latex mattresses: Latex mattresses provide good support while allowing for some elasticity and are friendly to sensitive skin.


4.2 Choosing the right mattress firmness


  • Moderate mattress: Suitable for most people and provides adequate support.
  • Soft mattress: suitable for those who are lighter or prefer to sleep on their side.
  • Firm mattress: suitable for people who need more back support.


4.3 Breathability and comfort of the mattress


A breathable mattress can help dissipate heat and provide you with a cooler sleeping experience.

Suilong mattresses are breathable and cooler thanks to their individual pocket springs and non-woven design.


4.4 Longevity and Maintenance


High-quality mattresses last longer and maintain their shape and comfort over time.

Taking care of your mattress the right way, such as flipping it regularly, will ensure it stays in top condition.


4.5 Budget and Brand Selection


Choosing an affordable, high-quality mattress doesn't have to mean going for the most expensive.

Brands such as Suilong, which has been specialising in mattress manufacturing for 25 years, can be trusted to provide the best service to their valued customers.


5. Should I worry when I sleep with a fever?


Before analysing this question calmly, let us understand one thing: slight fluctuations in body temperature are normal. However, a persistent, noticeable fever can be a sign of some hidden health problem.


5.1 Understanding the natural fluctuations in body temperature


The human body experiences natural fluctuations in body temperature throughout the day. Typically, early in the evening, body temperature decreases, helping us to fall into a deep sleep. As the night progresses, especially in the early hours of the morning, the body temperature gradually rises.


Short-lived versus persistent fever


If you occasionally feel that your body temperature is slightly higher while you sleep, it may just be because of the room temperature, bedding or pyjamas. But if you find yourself running a fever every night, or even waking up with soaking wet clothes, it could be a sign of a deeper problem.


5.2 Possible health problems


  • Hormonal imbalance: certain hormones, such as thyroxine, regulate body temperature. Fluctuations in hormone levels, such as menopause or thyroid problems, can lead to nighttime fever.


  • Low blood sugar: In people with diabetes, low blood sugar at night may cause sweating and fever.


  • Infections and inflammation: Certain long-term or chronic infections, such as tuberculosis or HIV, may cause nighttime fever or sweating.


5.3 How to cope and get help


Observe and record: Before worrying, keep observing for a while and record your temperature at night to see if there is a pattern.


Seek medical advice: If you think the fever is more than just environmental, then you should consult your doctor as soon as possible. Describe your symptoms and provide the information you have recorded to help your doctor make a diagnosis.


5.4 Influence of lifestyle habits


Lifestyle habits such as diet, exercise and stress management can affect sleep and body temperature. Trying to make changes such as reducing caffeine intake, increasing exercise, or practising meditation and deep breathing may help to improve symptoms.


6. How to avoid feeling hot while sleeping


  1. Adjust the indoor environment


Improve room ventilation: Make sure your room has enough air circulation. Consider opening a window or using an electric fan in the summer, as this will help your body dissipate heat and provide fresh air at the same time.


Control room temperature: Air conditioning is a great tool, but if not, consider using cooling pads or scattering frozen ice packs on your bed before bedtime.


  1. Choose the right bedding


Optimise sheet material: use breathable cotton or silk sheets. Synthetic materials may block air flow and lead to overheating.


Adjust quilt thickness: Change the quilt according to the season. Light quilts are good for summer, while thicker quilts are good for winter.


  1. Revisit your mattress


Choose the right mattress: There are many types of mattresses on the market, such as latex, memory foam and spring, each with its own unique breathability and support. Make sure you choose a mattress that is right for you, comfortable and helps dissipate heat.


  1. Change your diet


Avoid alcohol and caffeine: especially before bedtime, they can cause your body temperature to rise.


Avoid spicy foods: some people find that they sweat more easily after eating spicy foods.


  1. Exercise regularly, but avoid bedtime exercise


Release excess energy: regular exercise can help boost your metabolism, but exercising before bed can cause your body to overheat, so it's best to do it earlier in the evening.


  1. Consider changing your pyjamas


Choose breathable materials: Wearing pajamas made of cotton or other breathable materials can help dissipate heat.


Avoid tight or heavy pyjamas: loose-fitting pyjamas allow the skin to 'breathe'.


  1. Take a cool shower


Reduce your body temperature: A gentle shower or bath before bed can help reduce your body temperature and make it easier to fall asleep.


  1. Check your health regularly


Troubleshooting potential illnesses: If you try the above suggestions and still feel hot more often than not, you may need to see your doctor to make sure you don't have any other health problems, such as menopause, thyroid problems, or other endocrine disorders.


After this article, hopefully you've gained a clearer understanding of temperature fluctuations during sleep. By understanding the reasons behind this, and incorporating practical advice, you will be more likely to enjoy a cool, cosy night. Remember, choosing the right environment and materials for your sleep is crucial, and if you're still facing this issue, consider our Suilong brand. Specialising in the study of ergonomics, we always provide you with scientific sleep solutions.




Q: How can I stop myself from overheating at night?

A: To prevent overheating at night:


  • Choose breathable, moisture-wicking bed linens and sleepwear.
  • Ensure good room ventilation or use a fan.
  • Limit heavy meals and caffeine before bedtime.
  • Take a cool shower before sleeping.
  • Adjust your thermostat to maintain a cooler room temperature.


Q: Why is my boyfriend so hot at night?

A: There could be several reasons for your boyfriend feeling hot at night:


  • Increased metabolic rate, especially after a workout or heavy meal.
  • Certain medications or medical conditions that raise body temperature.
  • Hormonal imbalances or testosterone fluctuations.
  • Using heavy blankets or sleeping in non-breathable fabrics.
  • Dehydration, as the body struggles to regulate its temperature without enough fluid.


Q: Why does my head get hot at night?

A: Experiencing a hot head at night can be attributed to:


  • Elevated body temperature due to infections or fever.
  • Wearing tight or non-breathable headwear.
  • Stress or anxiety, as they can cause increased blood flow to the head.
  • Hormonal changes, especially in women during their menstrual cycle.
  • Underlying medical conditions or migraines.


Q: What causes too much heat in the body?

A: Excessive body heat can be caused by:


  • High ambient temperatures and humidity.
  • Intense physical activity or overexertion.
  • Thyroid or other endocrine disorders.
  • Dehydration, affecting the body's cooling system.
  • Certain medications or substances, like caffeine and spicy foods.


Q: What deficiency causes body heat?

A: A deficiency in certain vitamins and minerals, notably Vitamin B12, Vitamin D, magnesium, and potassium, can impact the body's ability to regulate its temperature. Such deficiencies might cause heat intolerance, where the body feels overly hot in response to warm conditions or slight exertion. If you suspect a deficiency, it's essential to consult a doctor or nutritionist for proper diagnosis and guidance.

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