Observatoire des droits humains (anglais seulement)

Why we used to sleep in two segments – and how the modern shift changed our sense of time

(Version anglaise seulement)

par Darren Rhodes, Lecturer in Cognitive Psychology and Environmental Temporal Cognition Lab Director, Keele University, Keele University

Continuous sleep is a modern habit, not an evolutionary constant, which helps explain why many of us still wake at 3am and wonder if something’s wrong. It might help to know that this is a deeply human experience.

For most of human history, a continuous eight-hour snooze was not the norm. Instead, people commonly slept in two shifts each night, often called a “first sleep” and “second sleep.” Each of these sleeps lasted…

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