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. 2017 Mar 1;40(3):zsx006.
doi: 10.1093/sleep/zsx006.

How Many Sleep Diary Entries Are Needed to Reliably Estimate Adolescent Sleep?

Michelle A Short  1   2 , Teresa Arora  3   4   5 , Michael Gradisar  2 , Shahrad Taheri  4   5   6 , Mary A Carskadon  1   7
Affiliations

How Many Sleep Diary Entries Are Needed to Reliably Estimate Adolescent Sleep?

Michelle A Short et al. Sleep. .

Abstract

Study objectives: To investigate (1) how many nights of sleep diary entries are required for reliable estimates of five sleep-related outcomes (bedtime, wake time, sleep onset latency [SOL], sleep duration, and wake after sleep onset [WASO]) and (2) the test-retest reliability of sleep diary estimates of school night sleep across 12 weeks.

Methods: Data were drawn from four adolescent samples (Australia [n = 385], Qatar [n = 245], United Kingdom [n = 770], and United States [n = 366]), who provided 1766 eligible sleep diary weeks for reliability analyses. We performed reliability analyses for each cohort using complete data (7 days), one to five school nights, and one to two weekend nights. We also performed test-retest reliability analyses on 12-week sleep diary data available from a subgroup of 55 US adolescents.

Results: Intraclass correlation coefficients for bedtime, SOL, and sleep duration indicated good-to-excellent reliability from five weekday nights of sleep diary entries across all adolescent cohorts. Four school nights was sufficient for wake times in the Australian and UK samples, but not the US or Qatari samples. Only Australian adolescents showed good reliability for two weekend nights of bedtime reports; estimates of SOL were adequate for UK adolescents based on two weekend nights. WASO was not reliably estimated using 1 week of sleep diaries. We observed excellent test-rest reliability across 12 weeks of sleep diary data in a subsample of US adolescents.

Conclusion: We recommend at least five weekday nights of sleep dairy entries to be made when studying adolescent bedtimes, SOL, and sleep duration. Adolescent sleep patterns were stable across 12 consecutive school weeks.

Keywords: adolescent; reliability; sleep; sleep diary; test–retest..

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Figures

Figure 1
Figure 1
Mean (SD) values for bedtime (A), sleep onset latency (B), wake time (C), and sleep duration (D). Nights are Sunday night to Saturday night. Weekend nights are outlined in black.
See this image and copyright information in PMC

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References

    1. Buysse DJ, Ancoli-Israel S, Edinger JD, Lichstein KL, Morin CM. Recommendations for a standard research assessment of insomnia. Sleep. 2006; 29(9): 1155–1173. - PubMed
    1. Wohlgemuth WK, Edinger JD, Fins AI, Sullivan RJ., Jr How many nights are enough? The short-term stability of sleep parameters in elderly insomniacs and normal sleepers. Psychophysiology. 1999; 36(2): 233–244. - PubMed
    1. Acebo C, Sadeh A, Seifer R, et al. Estimating sleep patterns with activity monitoring in children and adolescents: how many nights are necessary for reliable measures? Sleep. 1999; 22(1): 95–103. - PubMed
    1. Moore M, Kirchner HL, Drotar D, Johnson N, Rosen C, Redline S. Correlates of adolescent sleep time and variability in sleep time: the role of individual and health related characteristics. Sleep Med. 2011; 12(3): 239–245. - PMC - PubMed
    1. Fuligni AJ, Hardway C. Daily variation in adolescents’ sleep, activities, and psychological well-being. J Res Adolescence. 2006; 16(3): 353–378.