title: Morningness-eveningness preference and mood in Japanese junior high school students.
abstract: The relationship between morningness-eveningness (M-E) preference and mood in Japanese students aged 12-15 years (690 boys and 649 girls) was investigated. No significant difference in M-E preference was seen between genders. Girls became gloomy more frequently than boys, whereby the girls who experienced melancholy more frequently tended to prefer evening. The correlation between mood and M-E preference, which was demonstrated only by girls, might be linked to a rapid shift to evening preference by girls in the past couple of years.
authors.affiliation: Laboratory of Environmental Physiology, Faculty of Education, Kochi University, Kochi, Japan. rhythmsyn@hotmail.com
authors.forename: Hitomi
authors.initials: H
authors.lastname: Takeuchi
authors.forename: Hiromi
authors.initials: H
authors.lastname: Morisane
authors.forename: Akira
authors.initials: A
authors.lastname: Iwanaga
authors.forename: Natsumi
authors.initials: N
authors.lastname: Hino
authors.forename: Aya
authors.initials: A
authors.lastname: Matsuoka
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Harada
mesh_terms: D000293:Adolescent; D000339:Affect; D002755:Choice Behavior; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D012737:Sex Factors; D012890:Sleep; D013334:Students; D011795:Surveys and Questionnaires; D014851:Wakefulness / Q000502:physiology*