: The researchers determined, by fitting participants in each community with wrist devices that logged data about sleep-wake cycles, that those with access to electricity slept less in the summer, according to The Independent. Apple watch: will we wear it Researchers gathered data during one week in the summer and one week in the winter and found a shift in both the timing and duration of sleep. The communities share the same ethnic and socioeconomic background but only one has free access to electricity, while the other relies exclusively on natural light. In the summer, those with access to electricity slept approximately 40 minutes less than their counterparts who depended on natural light, as they went to sleep later but woke around the same time. It is the first study of its kind to document the relationship between access to artificial light and the amount of sleep humans get each night. "What this suggests is that early humans may have had longer periods of rest than people in most industrialized societies experience today," said Yale University biological anthropologist Eduardo Fernandez-Duque, a co-author of the paper. In the winter, participants with electricity slept about an hour less than participants without electricity.
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