Abstract
In Japan, nearly 80% of heatstroke occurrences in recent years have involved people older than 65 years old. This study surveyed the actual use of cooling by elderly people at sleep time compared to those found for younger people. Results revealed the followings.
1) Ratios of cooling use at sleep time were 30.8% for elderly people and 57.4% for younger people. The respective ratios of natural ventilation use at sleep time were 39.9% and 32.4%.
2) Average wet bulb globe temperatures (WBGTs) of bed rooms during sleep were 26.9°C for elderly people and 26.4°C for younger people. 3) Elderly people feel warmer than younger people but they feel more thermally comfortable. 4) Sleep scores were 49.7 for elderly people and 48.5 for younger people. No difference was found for the frequency of night waking or the Sleep maintenance score, but the Fatigue recovery score showed the greatest difference between elderly and younger people.
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