Sleep is essential for cognitive performance, emotional balance, and physical recovery. Deep sleep supports memory consolidation and physiological restoration yet sleep disorders and insufficient sleep are increasingly common. According to ResMed’s 2025 Global Sleep Survey, one third of people struggle to fall or stay asleep at least three nights per week, and only four out of seven nights are perceived as truly restful. Despite increased awareness of sleep health, we tend to overlook a silent factor: the air we breathe at night. Unlike poor sleep, which we feel immediately, poor ventilation and elevated CO₂ levels are invisible and odorless. Carbon dioxide (CO₂) is a naturally occurring gas exhaled by humans and widely used as a reliable proxy for ventilation adequacy. In enclosed indoor environments such as bedrooms, CO₂ levels can rise rapidly overnight due to respiration and insufficient ventilation. While CO₂ is not toxic at typical indoor concentrations, growing scientific evidence shows that poor ventilation can impair sleep quality, alter brain function, and disrupt autonomic regulation.
Continuous CO₂ monitoring is therefore essential to identify ventilation issues and enable targeted improvements in bedroom air quality.
