Most people have no idea that the air in their bedroom deteriorates significantly over the course of a night’s sleep. As you breathe, you exhale carbon dioxide. In a closed room with no ventilation, CO₂ levels can climb from a healthy 400ppm to over 1,200ppm by 3am.
What the science says
Research published in the journal Indoor Air found that CO₂ concentrations above 800ppm are associated with reduced slow-wave and REM sleep. Above 1,000ppm, the effects become measurable even in healthy adults: slower cognition the following morning, reduced alertness, and a subjective sense of having slept poorly.
The simple fix
Open a window slightly, or invest in a CO₂ monitor so you can see exactly when your room crosses the threshold. We designed the zzzshbase Air Monitor to give you a real-time readout — not as a gimmick, but because the data changes behaviour.
When you can see 847ppm in red on your monitor at midnight, you crack the window. And you sleep better.
