Technologyfor soundsleepbased on human circadianrhythm Hiroki NOGUCHI Lighting Research Center Lighting Manufacturing Business Unit Matsushita Electric Works, Ltd. 1048, Kadoma, Osaka 571-8686, Japan Toshio NAKANO Research & Development Center Home Appliances Manufacturing Business Unit Matsushita Electric Works, Ltd. 1048, Kadoma, Osaka 571-8686, Japan Creatures on Earth have circadian system to live efficiently in light/dark cycle of 24-hour. After twilight, core body temperature and alertness start declining following beginning of melatonin secretion in human. These physiological functions help us sleep soundly. In the first half of this paper, core body temperature and melatonin known as indices reflecting circadian rhythmicity are explained regarding the relationship between its circadian variation and sleep. Later, some specific ways to support sound sleep by designing lighting environment and bedroom from the viewpoint of circadian physiology are introduced. (Japanese Journal of Physiological Psychology and Psychophysiology, 25(1) : 73-87, 2007.) Key words : circadian rhythm, sleep promotion, lighting, body temperature and melatonin
Figure 1. Core body temperature in a regular schedule (shin line) and laying condition (solid line). (Nakano et al. 1997).
Figure 2. Core body temperature in the baseline period (left) and the second-week of dawn lighting (right). a: alarm clock, b: dawn lighting.
Figure 3. OSA sleepiness scale Figure 4. Mean SE in rectal temperature
Figure 5. Experimental conditions
Figure 6. Variation of urinary melatonin after waking up
Figure 7. Variation of rectal temperature Table 1. Change of the amplitude of circadian rectal temperature rhythm
Figure 8. Variation of salivary melatonin concentration Figure 9. Relationship between melatonin suppression and sleep phase
Figure 10. Sleep latency Figure 11. Support for sound sleep based on sleep/wake cycle
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