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Storia in 2 fonti
The eight-hour sleep rule is outdated. Here’s how much you really need
The idea dates back to the mid-19th century when the notion of eight hours of work, eight for recreation and eight for sleep first took hold
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2 prospettive sulla stessa storiaTimeline cronologica
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www1.folha.uol.com.br
Sono ideal de adultos varia e põe em xeque regra das 8 horas
Revisão científica indica que menos horas dormidas por noite pode ser suficiente
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independent.co.uk
The eight-hour sleep rule is outdated. Here’s how much you really need
The idea dates back to the mid-19th century when the notion of eight hours of work, eight for recreation and eight for sleep first took hold