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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.(More)
The effects of light conditions during night sleep on sleep habits and morning-evening preference were studied in Japanese students (18-28 years old). Students who usually used fluorescent or non-fluorescent light on the room ceiling, wall or desk preferred to have a daytime nap significantly later (Mean: 14:50 h) than those who used no light (13:34 h).(More)
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