수면 초기 실내 온도 변동이 인체 생리에 미치는 영향

Abstract

Existent researches about indoor thermal environment had been focused on to seek human's comfort in daytime. Also researches about thermal comfort during the sleeping time that is important time for resting and recharging to modern people had been seldom existed. At present, as global warming phenomenon is being continued, most people are going through inconvenience by sultriness during sleeping time when sweltering night in summer. Therefore we need another control method of air conditioner to keep human's thermal comfort. This research recognized about optimal temperature in forepart of sleep to maintain proper skin temperature and comfort sleep when indoor air is cooled by air conditioner in sweltering summer night. Ambient temperature is a common factor of the environment, but some of its effects on human body physiology are still unknown. The effects of ambient temperature on human sleep have been increasingly studied in the last decade, the main reason being that in animals thermoregulatory processes have been found present in SWS and absent in REM sleep. In laboratory situations, the general interest was first focused on low and mainly high ambient temperatures fluctuation has been paid to the influence of ambient temperatures fluctuation around thermoneutrality. It appears, however, that even slight changes of the ambient temperature within the thermoneutrality zone can induce modifications of sleep structure. The body core temperature shows a strong circadian rhythm, with a usual range of variation of about 1℃. It has been suggested that this is due to an endogenous variation of the thermoregulatory set point, which is higher in the afternoon than in the morning. However, body core temperature also varies in response to a variety of imposed behavioral and external stimuli, including sleep, physical activity, postural changes, ambient temperature and meals. It has been a common observation that body temperature falls after sleep onset, both in entrained and in free-running conditions. As it appears that thermoregulatory responses are sleep stage-dependent, it is important to determine whether or not thermal sensitivity is sleep stage dependent. As result in this research, we had found the fact that particular change of air-conditioner temperature helps to maintain comfort skin temperature and body core temperature during the sleeping hours.