Doctor reveals why air conditioning is waking you up at 3 a.m. and how to fix it from tonight - Yahoo Health

What the report says

Tom’s Guide reports that heavy overnight air-conditioning use may contribute to middle-of-the-night wakeups when systems are poorly maintained. The article cites Dr. Dale Christensen, chief science officer for Climatic Health and an adjunct associate professor of medicine at Duke University Medical Center, who said sleep can be disrupted when breathing comfort is affected during the night.

According to Tom’s Guide, Christensen said air conditioners are not automatically harmful to indoor air quality if filters are kept in good condition. The concern is neglected HVAC equipment, where dust, moisture and mold can accumulate in filters, ducts or cooling components and then circulate particles or spores indoors. The article links this irritation to symptoms such as congestion, coughing or breathing difficulty, which may lead to repeated nighttime awakenings.

The report also notes that indoor air pollution can come from other household sources, including gas stoves, candles, incense, air fresheners, some cleaning products, fireplaces and materials that release volatile organic compounds. Tom’s Guide cites Christensen as saying indoor pollutant exposure has been associated with inflammation and oxidative stress, which may interfere with sleep-wake regulation. The article also references U.S. Census Bureau data that most American households use air conditioning, underscoring the relevance of maintenance during summer heat.

The practical advice highlighted by Tom’s Guide includes replacing or checking AC filters regularly, with the CDC cited as recommending filter replacement every three months to reduce airborne germs and respiratory illness risk. The article also recommends improving ventilation when outdoor air quality is acceptable, using exhaust fans, considering HEPA air purifiers with closed windows, and reducing heavily fragranced or high-VOC products indoors.