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Current lifestyles often involve activities during the day and at night, and disruption of habits and sleep–wake rhythms may result in circadian rhythm disorders. We assessed the sleep habits and lifestyle habits in 52 subjects using the Japanese-language version of Horne and Ostberg's Morningness-Eveningness Questionnaire and the Tokyo Neurosciences General Laboratory Formula Examination of Life Habits. Of the 52 subjects, 9.6% were morning-types, 71.2% were intermediate-types, and 19.2% were evening-types. Of the evening-types, 40% had a variation in sleep time of more than two hours, and 20% had a variation in awakening time of more than two hours. Approximately 80% of the morning-types and 20% of the evening-types reported pleasant awakening experiences. Assessment of actual conditions of sleep and lifestyle habits using simple and highly reliable questionnaires may be useful in the prevention of sleep disorders and in the improvement of sleep and lifestyle habits.
Sukegawa et al. (Mon,) studied this question.