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is associate professor of evolutionary anthropology at the University of Toronto, Canada. His research investigates the link between sleep and human evolution through revolutionary new approaches, recording sleep data sets and sleep architecture for a range of primates, including lemurs, zoo orangutans, wild chimpanzees and humans living in different types and scales of societies. As part of his research, he has lived among Hadza hunter-gatherer communities in Tanzania, and spent the night in a chimpanzee nest. His latest book is The story of sleep in human evolution.