From the end of the rainy season, the hot day, which recorded 30℃ or more every day, continued for a while in Japan.
Because of the heat, it is hard to sleep, or there might be some people have lack of sleep at night.
Why is it hard to sleep on hot nights?
Human body needs to lower the body temperature in order to sleep deeply. As a mechanism of the body, the limbs are heated to dissipate heat, or sweat is used to release heat by the heat of vaporization. The deeper you sleep, the lower the temperature inside the body, which is called the core body temperature, falls, but you can’t sleep well in the summer because it is said that “the temperature of your body does not fall sufficiently.”
Humidity control is important as well as temperature.
The highest amount of sweating while sleeping is immediately after falling asleep. However, from the rainy season to the summer in Japan, the humidity becomes extremely high, so sweat does not dry sufficiently, body temperature adjustment does not work well, and sleep becomes poor.
It is said that “the temperature of the bedroom is 28℃ or less and the humidity is 40 to 60%” is ideal for getting good quality sleep, and not only the “temperature” but also the “humidity” control is important.
This time, I introduce the way of using the air conditioner in order to get a good sleep while in this hot and humid in Japanese summer.
【How to use a comfortable air conditioner on a summer night】
1. Use air conditioner all night
“Set 28℃ or above and use dehumidification function.”
On hot nights, it is better to keep the air conditioner all night long so that the room temperature will be stable.
Set the temperature to 28 ℃ or higher and reduce the humidity setting to 50-60% during dehumidifying operation. By lowering the humidity, you can lower the feels-like temperature without overcooling the body temperature and dry the sweat immediately after falling asleep, which makes the environment easier to sleep.
However, the feels-like temperature varies depending on the muscle mass, so it is necessary to make adjustments such as clothing and bedding.
2. Set off timer in 3 hours
“Your favorite temperature & set a timer that is off after 3 hours.”
By cooling the room well before falling asleep, you can dry sweat immediately after going to bed, and also control the humidity to create a comfortable sleeping environment. At this time, if you set the “off timer” to 3 hours, you can secure deep sleep immediately after falling asleep without being disturbed by temperature changes.
I think that many people say, “I used to sleep without an air conditioner.” However, the environment is changing due to the effects of abnormal weather and etc.
If you are unable to sleep well due to the heat and become sleep deprived, your autonomic nerves may be disturbed and, in the worst case, may cause heat stroke during sleep. That’s why we want to make good use of the air conditioner, to secure good quality of sleep and to stay healthy.
BY MK