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Bedtime smart device usage and accelerometer-measured sleep outcomes in children and adolescents.

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journal contribution
posted on 27.08.2021, 10:42 by Paul H Lee, Andy CY Tse, Teris Cheung, CW Do, Grace PY Szeto, Billy CL So, Regina LT Lee

Purpose

We analyzed the association between bedtime smart device usage habits and accelerometer-measured sleep outcomes (total sleeping time, sleep efficiency, and wake after sleep onset) in Hong Kong children and adolescents aged 8-14.

Methods

A total of 467 students in Hong Kong participated in this study from 2016 to 2017. They self-reported their bedtime smart device usage habits. The primary caregiver of each participant was also invited to complete a self-administered questionnaire about the family's social-economic status and bedtime smart device usage habits. An ActiGraph GT3X accelerometer was used to assess participants' 7-day sleep outcomes.

Results

The mean age of the participants was 10.3 (SD 1.9), and 54% were girls. Among the participants, 27% (n = 139) used a smart device before sleep, and 33% (n = 170) kept the smart device on before sleep. In total, 27% (n = 128) placed the smart device within reach before sleep, 23% (n = 107) would wake up when notifications were received, and 25% (n = 117) immediately checked the device after being awakened by a notification. Multiple regression controlling for age, sex, socio-economic status, and other confounders showed that those who woke up after receiving a notification had a statistically longer sleeping time (19.7 min, 95% CI: 0.3, 39.1, p = 0.046), lower sleep efficiency (- 0.71%, 95% CI - 1.40, - 0.02, p = 0.04), and a longer wake after sleep onset (2.6 min, 95% CI: 0.1, 5.1, p = 0.045) than those who did not. Nonetheless, all primary caregivers' bedtime smart device habits were insignificantly associated with all sleep outcomes of their children.

Conclusion

Those who woke up after receiving smart device notifications had lower sleep efficiency and longer wake after sleep onset than those who did not, and they compensated for their sleep loss by lengthening their total sleep time.

Funding

The Food and Health Bureau of the Hong Kong Special Administrative Region, China, provided financial support in the form of a grant from the Health and Medical Research Fund (Ref 13144041).

History

Citation

Lee, P.H., Tse, A.C.Y., Cheung, T. et al. Bedtime smart device usage and accelerometer-measured sleep outcomes in children and adolescents. Sleep Breath (2021). https://doi.org/10.1007/s11325-021-02377-1

Author affiliation

Department of Health Sciences

Version

VoR (Version of Record)

Published in

Sleep and Breathing

Publisher

Springer

issn

1520-9512

eissn

1522-1709

Acceptance date

09/04/2021

Copyright date

2020

Available date

27/08/2021

Spatial coverage

Germany

Language

eng

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Licence

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