Author(s)

Takahiro Kawada¹, Kotaro Oki², Yumiko Yamazaki², Fujiko Tsuji^2,3, Miyo Nakade⁴, Teruki Noji¹, Milada Krejci³, Hitomi Takeuchi², Tetsuo Harada^2*

¹Center for Regional Collaboration, Kochi University, Kochi, Japan.
²Laboratory of Environmental Physiology, Graduate School of Integrated Arts and Sciences, Kochi University, Kochi, Japan.
³University of Physical Education and Sports PALESTRA, Prague, Czech Republic.
⁴Faculty of Health and Nutrition, Tokai-Gakuen University, Nagoya, Japan.

Many studies have shown that smoking can be related to worse sleep quality. However, as the impact of smoking, double view points on mental health and chronotype have been shortened. An integrated questionnaire including the diurnal type scale constructed by Torsvall & ?kerstedt, and questions on smoking was administered to 1376 students attending university and mental training schools (693 women and 683 men), 19.9 years on average in 2010-2013. Only 4.1% of the participants were smokers and they tended to be more evening-typed than non-smokers (p = 0.061). Smokers had significantly more difficulty falling asleep (p = 0.003) and more frequently lacked emotional control (p = 0.001) than non smokers. Smoking, being evening-type and having poor mental health may all be correlated in students attending Japanese university and medical training schools.

Smoking, Circadian Typology, Sleep Quality, Late-Night TV

Kawada, T. , Oki, K. , Yamazaki, Y. , Tsuji, F. , Nakade, M. , Noji, T. , Krejci, M. , Takeuchi, H. and Harada, T. (2016) Impact of Smoking on Circadian Typology, Sleep Habits and Mental Health of Japanese Students Aged 18 - 30 Years. Psychology, 7, 1211-1216. doi: 10.4236/psych.2016.79122.