Health AI Central
Peer-Reviewed Publication
Sleep Med2023;110155-165.October 1, 2023Journal Article

Country differences in nocturnal sleep variability: Observations from a large-scale, long-term sleep wearable study.

Adrian R Willoughby1, Iman Alikhani2, Mari Karsikas2, Xin Yu Chua1, Michael W L Chee3
1Centre for Sleep and Cognition, Yong Loo Lin School of Medicine, National University of Singapore, 12 Science Drive 2, Singapore, 117549, Singapore.
2Oura Health Oy, Oulu, Elektroniikkatie 10, 90590, Finland.
3Centre for Sleep and Cognition, Yong Loo Lin School of Medicine, National University of Singapore, 12 Science Drive 2, Singapore, 117549, Singapore. Electronic address: michael.chee@nus.edu.sg.
PubMed DOI

Abstract

STUDY OBJECTIVES: Country or regional differences in sleep duration are well-known, but few large-scale studies have specifically evaluated sleep variability, either across the work week, or in terms of differences in weekday and weekend sleep. METHODS: Sleep measures, obtained over 50 million night's sleep from ∼220,000 wearable device users in 35 countries, were analysed. Each person contribute…

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