Temporal changes in obesity and sleep habits in Hong Kong Chinese school children: a prospective study.

Sci Rep · 2019 · PMC6458117 · PMID 30971731

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a decreasing trendno p-value reported

Although a recent systematic review of 12 studies reported a decreasing trend of mean sleep duration from the 1960s until 2000s in a few Asian and European populations 7 , there is a dearth of data exploring temporal changes in sleep duration in children and adolescents.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.