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Regularity of daily life in relation to personality, age, gender, sleep quality and circadian rhythms

SUMMARY  A diary‐like instrument to measure lifestyle regularity (the 96 subjects (48 women, 48 men), 39 of whom repeated the study after at least one year, with additional objective measures of rest/activity. Lifestyle regularity as measured by the SRM related to age, morningness, subjective sleep quality and time‐of‐day variations in alertness, but not to gender, extroversion or neuroticism. Statistically significant test‐retest correlations of about 0.4 emerged for SRM scores over the 12–30 month delay. Diary‐based estimates of bedtime and waketime appeared fairly reliable. In a further study of healthy young men, 4 high SRM scorers (‘regular’) had a deeper nocturnal body temperature trough than 5 low SRM scorers (‘irregular’), suggesting a better functioning circadian system in the ‘regular’ group.