Premium
Secular changes in sleep duration among Australian adults, 1992–2006
Author(s) -
Bin Yu Sun,
Marshall Nathaniel S,
Glozier Nicholas S
Publication year - 2011
Publication title -
medical journal of australia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.904
H-Index - 131
eISSN - 1326-5377
pISSN - 0025-729X
DOI - 10.5694/mja11.10302
Subject(s) - medicine , demography , sleep (system call) , duration (music) , significant difference , gerontology , operating system , art , literature , sociology , computer science
Objective: To determine whether sleep duration of Australian adults has declined over recent years. Design: Analysis of nationally representative data from repeated cross‐sectional time‐use surveys conducted in 1992, 1997 and 2006. Setting: Private households in Australia. Participants: Respondents aged 15 years and over ( N = 21 195) who completed time‐use diaries over two consecutive days. Main outcome measure: Change in sleep duration by sociodemographic group. Results: Mean sleep duration was 8 h 20 min in 1992, 8 h 33 min in 1997, and 8 h 30 min in 2006 (SEM for all years, 1 min). After adjustment for sampling during weekends and different seasons, there was no significant change in sleep duration from 1992 to 2006 (adjusted difference, 2 min; 95% CI, − 2 to 5 min; P = 0.33). The only significant decreases in sleep duration were observed in people aged 65 years and over (adjusted difference, 12 min; 95% CI, 4–19 min; P < 0.001), people with no income (adjusted difference, 17 min; 95% CI, 7–27 min; P = 0.001) and male carers (adjusted difference, 31 min; 95% CI, 9–53 min; P = 0.002), although people in these groups reported over 8 h sleep on average. Conclusions: Most Australian adults were not sleeping less in 2006 than they did in 1992. Public health concerns over declining sleep duration do not appear to be warranted. Investigation of possible changes in quality of sleep is required.