Nagai, K. (2007). Mechanism of effects of two kinds of scents, one that makes humans obese and another that reduces weight—The importance of the circadian clock. Aroma Research, 3 (in Japanese).

has been cited by the following article:

• TITLE: Effects of Makeup, Perfume and Skincare Product Usage and Hair Care Regimen on Circadian Typology, Sleep Habits and Mental Health in Female Japanesestudents Aged 18 - 30

  AUTHORS: Risa Nishihara, Kai Wada, Osami Akimitsu, Milada Krejci, Teruki Noji, Miyo Nakade, Hitomi Takeuchi, Tetsuo Harada

  KEYWORDS: Makeup; Perfume; Skin Care; Circadian Typology; Sleep Health; Mental Health; Japanese Students Aged 18 - 30 yrs

  JOURNAL NAME: Psychology, Vol.4 No.3, March 25, 2013

  ABSTRACT: Olfactory stimulation has been reported to trigger waking up during night sleep, and to affect the sympathetic nervous system and blood pressure of humans via the circadian clock system. Olfactory stimulation may promote better sleep health in Japanese students living in 24-hour society, but no studies have been done on this hypothesis. The purpose of this study is to make it clear what are the effects of makeup, perfume and skin care products on the circadian typology, sleep habits and mental health of female Japanese students aged 18 - 30 using an integrated questionnaire. Students who regularly used skin care products went to bed earlier on both weekdays and weekends and also got up earlier in the morning on weekdays than those who did not (p p 0.05). The students who regularly carried out a hair care regimen showed a significantly lower frequency of becoming angry after a small trigger and of losing control due to anger than those who did not. Makeup, perfume and skin care products might be possible to be related to better sleep health for students. Moreover, hair care may help maintain mental health in female students. Makeup, perfume and skin care products might be implied to become chemical, mechanical and/or psychological stimuli as zeitgebers for circadian clock of students.