Items intended to foster comfort or health can sometimes do the exact opposite. From the humidifier providing moisture to dry indoor air to the mattress where you spend a third of your life, improper maintenance can take a serious toll on respiratory and overall health.
In a recent social media video, pharmacist Choi Hyung-jae highlighted "five bedroom items that make your body sick." His list included stagnant humidifier water, an old mattress, an old rug, incense sticks, and a bedroom television.
Stagnant Humidifier Water
Choi identified standing water in a humidifier as the most immediate hazard. "If you do not replace the water in the tank frequently, bacteria and mold multiply and enter your airways alongside the mist," he explained. "This process can trigger lung inflammation, and severe cases have even led to fatal infant infections."
Leaving water in a humidifier reservoir allows bacteria and fungi to proliferate rapidly. Ultrasonic humidifiers pose a specific risk because they atomize water into fine droplets, dispersing microbes and contaminants directly into the air. Inhaling contaminated vapor repeatedly can cause persistent coughing, shortness of breath, and inflammatory lung conditions such as hypersensitivity pneumonitis.
To mitigate these risks, empty the humidifier tank daily, dry it completely, and refill it with fresh water while following manufacturer cleaning guidelines.
Aging Mattresses and Rugs
Over time, mattresses and rugs accumulate dead skin flakes and ambient dust, creating an ideal breeding ground for house dust mites. While dust mites do not bite or transmit infectious diseases, foreign proteins from their droppings and microscopic remains act as potent allergens.
"The older the mattress or rug, the higher the concentration of dust mites," Choi noted, warning that dust causes airway inflammation while mite allergens trigger allergic rhinitis and asthma flare-ups. Long-pile rugs are particularly prone to trapping debris between fibers, which is redistributed into the air when walked on or cleaned.
To protect against allergen buildup, wash bedding regularly, maintain balanced indoor humidity, and utilize allergen-impermeable covers. Wash or vacuum rugs frequently, or remove them from the bedroom entirely if you suffer from severe allergies.
Incense Sticks
While incense sticks are often used to create a soothing atmosphere, burning them generates significant indoor air pollution. The combustion process releases volatile organic compounds (VOCs) and fine particulate matter.
"Burning fragrance produces ultra-fine particles that, when inhaled, trigger systemic inflammation and elevate the risk of cardiovascular and cerebrovascular diseases," Choi warned. Using incense in a closed bedroom concentrates these pollutants rapidly. Proper ventilation is essential when burning incense, and it should never be left burning while sleeping.
Bedroom Televisions and Nighttime Light
Falling asleep with the television on or watching TV right before bed can significantly compromise health. Artificial light emitted from screens disrupts circadian rhythms and suppresses the secretion of melatonin, the hormone responsible for regulating sleep cycles.
Beyond inducing daytime fatigue, poor sleep quality interferes with metabolic health. "When you fail to achieve deep sleep, insulin resistance increases, which can lead to weight gain," Choi explained.
Research supports the link between nighttime light exposure and metabolic changes. A study published in JAMA Internal Medicine by researchers at the U.S. National Institutes of Health (NIH) followed 43,722 women over five years. The study found that women who slept with a television or light on had a 17 percent higher risk of gaining more than 5 kilograms compared to those sleeping in total darkness.
To foster a healthier sleep environment, maintain a strict cleaning schedule for bedroom textiles, replace air purifier and humidifier filters on time, and minimize exposure to artificial light and combustion pollutants at night.
