Highlights

• Sleeping with either windows or doors open improved subjective-rated sleep quality.
• Poorer perceived air quality decreased subjective-rated sleep quality.
• Higher CO₂ levels increased the drop in skin temperature during sleep.
• A higher drop in skin temperature increased the fraction of deep sleep.

Abstract

Parameters describing the bedroom environment and sleep quality were measured overnight for one week in 84 randomly selected actual bedrooms in Denmark from September to December 2020. The median age of participants was 26 years (interquartile range (IQR) (Laverge et al., 2015; Fan et al., 2021; Berglund et al., 1999; Zhang et al., 2016; Bjorvatn et al., 2017; Verbruggen et al., 2021; Liao et al., 2021; Xiong et al., 2020; Deng et al., 2021) [24-32] years); 41 were males. Carbon dioxide (CO₂), temperature, and relative humidity were measured continuously.

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