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People spend 1/3 of their life sleeping!
December 22, 2015

People spend 1/3 of their life sleeping!

People spend one-third of their life sleeping, 12–14 h/day during infancy and 7–8 h/day during adulthood, so this may well be essential to human health and wellbeing. Preferred bedroom temperatures vary widely as a function of sleepwear, bedcover insulation and drape, and mattress insulation, with a trade-off between what is thermally comfortable for sleep and for other activities in the bedroom while not asleep. However,bedrooms with the doors and windows closed for acoustic privacy and energy conservation are often very poorly ventilated indeed, and according to the association Sleep America (2004), 43% of school-age children under 10 have a TV set in their bedroom, and 11% have a computer. Both have been shown to contribute air pollution to indoor air (Bako-Biro et al.,2002; Nakagawa et al., 2003). Bek€o et al. (2010) recently reported that the outdoor air supply rate in 57% of the bedrooms of Danish children was lower than the minimum ventilation requirements stipulated in EN 15251:2007(E) for dwellings in general, and in a study of typical Belgian houses by Laverge and Janssens (2011), it was estimated that exposure to poor air quality is up to 16 times higher in the bedroom. If bedroom air quality affects sleep, there might be negative effects on next-day performance, as studies by Tynjala et al. (1999) and Meijer et al. (2000) among children in Finland and Holland, respectively, showed a strong correlation between sleep quality and the ability to concentrate the next day.

Read an interesting article by P. Strøm-Tejsen, D. Zukowska, P. Wargocki, and D. P. Wyon published in the Journal of INDOOR AIR, doi:10.1111/ina.12254. The article reports two field intervention experiments on how the effective ventilation rate in bedrooms affects sleep and next day performance.

The effects of bedroom air quality on sleep and next-day performance (link here).