Lower levels of carbon dioxide predict improved sleep and mental performance

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By Dr. Annemarie Luik

Bitesize research – a brief article summary from the Sleepio team:

Strøm-Tejsen et al. (2015). The effects of bedroom air quality on sleep and next day performance. Indoor Air, published online 9 October
http://dx.doi.org/10.1111/ina.12254

Should we open our bedroom windows during the night? This experimental study examined the effects of bedroom air quality on sleep and next day performance in a population of students. In two experiments the authors manipulated CO2 levels either by 1) keeping a window open or closed (n=14), or 2) controlling an inaudible fan to increase or decrease CO2 (n=16). Each participant experienced two conditions in balanced order. The outcomes were self-rated sleep and wellbeing, actigraph measured sleep and next-day tests of mental performance. CO2 levels were successfully manipulated with substantially lower CO2 levels in window ventilated rooms and mechanic ventilated rooms. Objective sleep, and the perceived freshness of bedroom air improved in ventilated rooms, as did self reported sleepiness and mental performance the day after. This small study suggests a benefit of ventilated bedrooms with lower circulating CO2 levels.

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