- 日本生理人類学会誌 (ISSN:13423215)
- vol.8, no.2, pp.69-73, 2003-05-25 (Released:2017-07-28)
We investigated the effects of cedrol, which is a sesquiterpene alcohol contained in cedarwood oil, on sleep using overnight polysomnography. This study included 11 healthy females (24.5±2.1 years). Days 1 and 2 were regarded as adaptation nights. Days 3 to 6 (4 days) were regarded as experimental nights. As the experimental condition, cedrol was volatilized for 4 hours starting from 2 hours before lights were turned off. No odor was given during the placebo condition. Each condition was performed for 2 consecutive days, in reverse order. Sleep time increased and sleep latency shortened in the presence of cedrol compared to those of sleep with placebo (p<0.05). Furthermore, sleep efficiency slightly increased in the presence of cedrol (p<0.10). Cedrol inhibited the excitement of the sympathetic nervous system and made the parasympathetic nervous system dominant, which may have made it easy to fall asleep.