Carbon dioxide levels in sleeping areas affect how well we sleep. Mishra and colleagues conducted a related study: “Bedroom carbon dioxide level, temperature, and relative humidity were measured over 5 days, for two cases: open window or door (internal, bedroom door), and closed window and door. . . . Average carbon dioxide level for the Open conditions was 717 ppm . . .and for Closed conditions was 1150 ppm. . . . Absolute humidity levels were similar for both conditions, while Open conditions were slightly cooler (mean = 19.7 degrees Celsius . . .) than Closed (mean = 20.1 degrees Celsius . . .).” Sleep quality was significantly better when doors/windows were open than when they were closed. Study participants perceived that they slept more deeply in the lower carbon dioxide conditions. Objective measures indicated that they slept more efficiently and woke fewer times when doors/windows were open.
A.Mishra, A. van Ruitenbeek, M. Loomans, and H. Kort.”Window/Door Opening-Mediated Bedroom Ventilation and Its Impact on Sleep Quality of Healthy Young Adults.” Indoor Air, in press.