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Port Adelaide, Australia

Tremaine R.B.,Center for Sleep Research | Dorrian J.,Center for Sleep Research | Blunden S.,Center for Sleep Research
Sleep and Biological Rhythms | Year: 2010

It is important to ascertain the accuracy of children's and adolescents' self-reported sleep estimates as they are usually the first (and sometimes only) measure of sleep taken by parents, clinicians, or researchers. In this study, sleep diaries were compared with actigraphy monitoring to investigate the correspondence between measures of sleep in children and adolescents and provide normative data. Differences in age, gender, and school day/weekend were investigated. Sixty-six (21 boys, 45 girls) children and adolescents (11-17 years) wore a wrist actigraphy monitor and completed a 7-day sleep diary. Measures of sleep onset, wake time, wake after sleep onset, and total sleep time were obtained. Less than recommended (9-11-h) amounts of sleep were obtained throughout the week and all participants underestimated the duration of their night wake. Children went to sleep significantly earlier and obtained more sleep than adolescents. Sleep onset and wake time were significantly later on weekends than school days for both age groups. No significant gender differences were found for any objectively measured sleep parameter. Correlations between diary and actigraphy were moderate to high and significant for sleep onset, wake time, and total sleep time. Paired samples t-tests indicated a significant difference between diary and actigraphy scores for all variables except children's sleep onset. Overall, children and adolescents overestimated their total sleep time by approximately an hour, primarily through an under appreciation of night awakenings. © 2010 The Authors. Sleep and Biological Rhythms © 2010 Japanese Society of Sleep Research. Source


Tremaine R.B.,Center for Sleep Research | Dorrian J.,Center for Sleep Research | Blunden S.,Center for Sleep Research
Sleep and Biological Rhythms | Year: 2010

In 2003 Monk and colleagues published a single-administration replacement for a standard sleep diary, the Sleep Timing Questionnaire (STQ). Reliable and valid for adult participants, it offers advantages over existing methodologies in cost and convenience. It takes approximately 10 min to complete but can yield information equivalent to a week of actigraphy, or a 2-week sleep diary. This study sought to validate the STQ for school-age children. Sixty-five children (20 boys, 45 girls), aged 11-16 years participated in this study. The participants wore wrist actigraphs, completed a 1-week sleep diary and the STQ. Analyses tested convergent validity between the STQ and actigraphy, and the STQ and sleep diaries. Correlations between STQ and actigraphy (r = 0.45-0.76, P < 0.001), and STQ and sleep diaries (r = 0.42-0.86, P < 0.001), were positive and significant for sleep onset and wake times. Correlations between STQ and actigraphy for sleep latency and wake after sleep onset (WASO) were very low (r < 0.10). In contrast, sleep latency was moderately and significantly correlated between STQ and sleep diary (r = 0.42, P < 0.001), and the correlation for WASO was high and significant (r = 0.74, P < 0.001). Differences between the STQ and sleep diary were within acceptable limits for all sleep parameters, and the differences between STQ and actigraphy were acceptable for sleep onset and school day wake time. The STQ may be a valid indicator of sleep onset and wake time in school-age children. It can also produce measures of sleep latency and WASO with comparable accuracy to a standard sleep diary. © 2010 The Authors. Journal compilation © 2010 Japanese Society of Sleep Research. Source

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