Key points from article :
A 2024 study highlights how indoor carbon dioxide (CO₂) levels can significantly impact sleep quality and next-day mental performance. The study split participants into three groups, sleeping in rooms with CO₂ concentrations of 750, 1,000, or 1,300 parts per million (ppm). Those in higher CO₂ environments experienced worse sleep and poorer cognitive performance the following day, emphasizing the importance of air quality on rest and alertness.
Modern buildings, designed to be energy-efficient, often have limited ventilation, which allows CO₂—mainly exhaled by people and pets—to accumulate indoors. While oxygen is essential for brain function, even moderately elevated CO₂ levels (above 750–1,000 ppm) can subtly impair wellbeing, especially sleep. Factors like tightly sealed windows, small spaces, multiple occupants, and gas stovetops can all raise indoor CO₂.
While indoor plants are often touted as air purifiers, they have minimal impact on CO₂ levels. More effective strategies include regularly opening windows or doors, using fans to circulate air, and investing in a CO₂ monitor to better understand and manage your environment.
The concept of FOCUS—Focus on Oxygen and CO₂ Uptake for Sleep—encourages people to consider their air quality as part of good sleep hygiene. It’s a simple, low-cost intervention that can have a meaningful impact over time.
