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Actigraphy-assessed sleep during school and vacation periods: a naturalistic study of restricted and extended sleep opportunities in adolescents.

Abstract：

:School-related sleep restriction in adolescents has been identified by studies comparing weekday and weekend sleep. This study compared weekday and vacation sleep to assess restricted and extended sleep opportunities. One-hundred and forty-six adolescents (47.3% male) aged 16.2 ± 1.0 years (M ± SD) from the general community wore an actigraph continuously for 4 weeks: the last week of a school term (Time-E), the following 2-week vacation, and the first week of the next term. Self-reported sleep was assessed for each of the three time intervals, and chronotype was assessed using the Morningness-Eveningness Questionnaire at Time-E. Daily actigraphy bedtime, rise-time, time-in-bed, total sleep time, sleep onset latency, sleep efficiency, and % wake after sleep onset were analysed using latent growth curve modelling. The removal of school-related sleep restriction was associated with an abrupt delay in sleep timing and increase in sleep duration. Subsequently, bedtime and rise-time showed further linear delays throughout the vacation, while changes in time-in-bed were non-significant. Sleep onset latency increased linearly, peaking in the middle of the second vacation week. Across the first vacation week, total sleep time and sleep efficiency linearly decreased, while % wake after sleep onset increased. These changes stabilized during the second vacation week. Older age and eveningness were associated with later bedtime and rise-time, whilst females had longer time-in-bed, total sleep time and sleep onset latency. Compared with school days, sleep during the vacation was characterized by later timing, longer duration, lower quality and greater variability. Recovery from school-related sleep restriction appeared to be completed within the 2 weeks of naturalistic extended sleep.

journal_name

J Sleep Res

journal_title

Journal of sleep research

authors

Bei B,Allen NB,Nicholas CL,Dudgeon P,Murray G,Trinder J

doi

10.1111/jsr.12080

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

107-17

issue

eissn

0962-1105

issn

1365-2869

journal_volume

pub_type

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Actigraphy-assessed sleep during school and vacation periods: a naturalistic study of restricted and extended sleep opportunities in adolescents.