First tropical night such as Seoul...3 Tips for Sleeping in the Summer Night
Jun 30, 2025
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Tropical nights, a phenomenon in which temperatures are maintained at more than 25 degrees Celsius overnight (6 p.m. to 9 a.m. the next day), are also in full swing in the hot weather of the rainy season. In Seoul, the lowest temperature recorded 25.6 degrees last night, and the first tropical night of the year was observed, and tropical nights were also seen in Seogwipo, Jeju, and Gangneung, Gangwon-do.
Tropical nights are much higher than the appropriate sleep temperature (18-20 degrees) required for our body to sleep normally. The quality of sleep is bound to decrease. In addition, it is expected that tropical nights will become more frequent this summer due to the acceleration of climate change. According to the Korea Meteorological Administration, the number of tropical nights reached a record high of 20.2 days last year.
On the 30th, the Evezari Sleep Environment Research Institute introduced three tips to help you sleep well in midsummer nights: ▲ Maintaining healthy sleeping habits ▲ Sleep management to overcome tropical nights ▲ Sanitary management of bedding during the rainy season.
First of all, maintaining a healthy sleeping habit in the summer starts with maintaining a constant circadian rhythm. In summer, when sunlight is long, it is important to equalize sleep and wake-up time every day. It is also helpful to reduce the use of smartphones late at night and stabilize the body and mind through simple stretching under lighting that lowers the illuminance before going to bed. Caffeine consumed late in the afternoon can sustain the wakefulness effect in the body, so it is recommended to limit caffeine drink intake during the morning hours.
Control of body temperature is the key to sleep management during tropical nights. If you use naturally derived bedding such as modal, human dog, and horse with excellent hygroscopicity and breathability, or blankets and pillows made of cold material, you can help control your body temperature for a good night's sleep and maintain comfort. Cooling devices such as air conditioners and fans maintain an appropriate temperature (26-28 degrees Celsius) and set a sleep timer to adjust the usage time, creating a cool sleep environment without interfering with a good night's sleep.
During the rainy season, when humidity is high, more attention should be paid to the creation of a sleeping environment. First of all, it is easy for mold and ticks to inhabit bedding, so special hygiene management is required. The hygiene status of bedding also directly affects its functionality. Blankets and pillows should be dried in the sun to avoid humid days, or in the case of materials that can be used in a dryer, they should be dried sufficiently using a dryer. In addition, it is ideal to keep the humidity in the bedroom at 40 to 60%, and for this purpose, it is helpful to use natural dehumidifiers such as charcoal, newspapers, and baking soda as well as dehumidifiers.
Cho Eun-ja, director of the Sleep Environment Research Institute, said, "High temperature and humidity interfere with body temperature regulation, sweat emissions, and induce arousal during sleep, which leads to poor sleep quality, which adversely affects fatigue recovery and immunity. Especially now that we are entering the era of climate change, it is of paramount importance to practice small lifestyles for a good night's sleep and to steadily manage the quality of sleep in the summer."
This article was translated by Naver AI translator.
