It's too cold to sleep with windows open when you feel uncomfortably chilly, but generally, a bedroom temperature of 16–19°C (60–66°F) is ideal, so aim for outdoor temperatures within a few degrees of that range for fresh air without excessive cold; temperatures below 12°C (53°F) can make it hard to fall asleep, and near freezing (0°C/32°F) is too cold for most people, especially with poor insulation, unless you're bundled up like a "Nordic sleeper".
Sleeping with an open window can negatively impact your health as well. While cold air itself can't make you sick -- colds and flus occur because germs overwhelm a person's immune system -- it can potentially dry out nasal cavities, resulting in increased mucus production and a possible sinus infection.
“The ideal sleep temperature is 65 to 67 degrees Fahrenheit, with or without windows opened,” says Weiss. Depending on where you live and the current weather, you may find it easier to maintain that temperature by keeping the windows closed.
Sleeping with an open window can negatively impact your health as well. While cold air itself can't make you sick — colds and flus occur because germs overwhelm a person's immune system — it can potentially dry out nasal cavities, resulting in increased mucus production and a possible sinus infection.
Leaving your windows open at night is a great way to ensure fresh air, but it also opens you up to some potential risks. The biggest consideration is the safety and security of your home. If you leave your windows open, there is an increased chance that a criminal may use these to gain entry into your home.
One of the primary advantages of sleeping with the window(s) open is improved air circulation and ventilation. Fresh air can help regulate temperature, reduce humidity, and lower carbon dioxide levels in your bedroom, creating a more conducive environment for restful sleep.
Sleeping with your bedroom door closed is a practice that significantly improves your chances of surviving a house fire. According to the FSRI, closing your door can greatly decrease carbon monoxide levels from 10,000 PPM to 1,000 PPM when compared to leaving it open.
Keeping a window open in winter can be a smart move or a costly mistake, depending on how you do it. Use it strategically to improve air quality or balance room temperatures, but avoid long periods of exposure that waste energy and strain your heating system.
Does Being Cold Make You Sick? Cold weather and frigid temperatures themselves do not manifest common colds or the flu. But physically being cold, physiologically, might contribute to a weakened immune system, therefore making your body more susceptible to viruses and airborne illnesses.
Keeping your home warm when you're feeling sick will certainly make you feel better. The last thing you want is to feel cold when trying to recover, so by maintaining an ideal indoor temperature and using energy-efficient heating solutions, you can be back to good health in no time.
Recognize the warning signs of hypothermia
The 3-2-1 sleep rule is a simple wind-down routine: stop eating and drinking alcohol 3 hours before bed, stop working/mentally stimulating activities 2 hours before, and turn off screens (phones, TVs) 1 hour before sleep, helping you transition to rest by reducing stimulants and preparing your mind and body. It's often part of a larger 10-3-2-1-0 rule, which also adds no caffeine 10 hours prior and no hitting snooze (0) in the morning.
Ideal room temperature for sleeping
According to The Sleep Charity, the ideal bedroom temperature for sleeping is 16–18°C. Anything over 24°C could be too hot and make you restless, while trying to sleep in a cold room with a temperature below 12°C could make it harder to nod off.
You should only open windows in the evening when the outside temperature is lower than the temperature on your thermostat. This method is usually effective when evening temperatures drop to around 70 degrees or less, which is common for later summer or early fall.
Winter tends to be dryer than other seasons, but it's not the only reason things feel dryer indoors. Your heating system removes what little moisture is still in your home's air, making your skin itchy, your sinuses dry, and so on. Opening the windows for a while reinvigorates the internal air with a touch of moisture.
The German practice of lüften — which translates to “ventilating” — involves fully opening windows for a short period to flush out stale air and bring in fresh outdoor air. This isn't just a quirky tradition; it's a science-backed way to maintain a healthier and fresher indoor environment.
Can freezing temperatures freeze your lungs? Your body does its best to keep your core temperature between 97 and 99 degrees Fahrenheit, and your lungs are encased within the thoracic cavity. Unless your whole body is at risk, freezing your lungs should not be a risk. Your body is well-designed to adapt to cold air.
4Low indoor temperatures and insulation. Cold air inflames lungs and inhibits circulation, increasing the risk of respiratory conditions, such as asthma attacks or symptoms, worsening of chronic obstructive pulmonary disease (COPD), and infection.
Most experts on the subject agree that a temperature between 60° F and 67° F is optimal for sleep (and your overall health). That said, you definitely don't want to go too much below or above that range—anything below 54° and anything above 75° is actually disruptive to your sleep.
Keep your bedroom cool. You may want to open a window, turn on the air conditioner, or place a fan in your room to gently circulate cool air throughout the space. While you may want to wrap up and stay warm in bed while fighting a cold, the warmth may actually disrupt your sleeping pattern.
Sleeping with the window open can bring in fresh air and help regulate room temperature, but it may also expose you to allergens, outdoor pollutants, noise, and potential safety risks.
Yes, you should open windows in winter, but only for short periods. Opening your windows for 10-15 minutes once or twice a day helps remove excess moisture, prevent mould, and improve indoor air quality without making your home noticeably colder.
Positioning your bed in line with the door is the worst possible position, according to the principles of Feng shui. People who practice Feng shui call it the 'dead man's position' or the 'coffin position' because the feet or head face the door and resemble how we carry the dead through open doors from the house.
Set it somewhere between 60 and 65 degrees Fahrenheit. People sleep better in that temperature range. “Not only in terms of maintaining sleep, but also of falling asleep,” says Alon Avidan, MD, MPH, director of the UCLA Sleep Disorders Center. That also goes for how long you sleep and how well.
It's better to leave interior doors open when heating your home. Open doors allow warm air to circulate evenly, preventing hot and cold spots and reducing the strain on your HVAC system. Closed doors can block airflow, making your system work harder and increasing energy costs.