A three-day-old bonobo sleeps on the belly of its mother in the zoo in Frankfurt, Germany. The fossil record suggests that 20 million years ago, the ancestors of humans and other apes, including chimps and bonobos, began to build sleeping platforms each night from sticks and other materials.
A three-day-old bonobo sleeps on the belly of its mother in the zoo in Frankfurt, Germany. The fossil record suggests that 20 million years ago, the ancestors of humans and other apes, including chimps and bonobos, began to build sleeping platforms each night from sticks and other materials. Michael Probst AP
A three-day-old bonobo sleeps on the belly of its mother in the zoo in Frankfurt, Germany. The fossil record suggests that 20 million years ago, the ancestors of humans and other apes, including chimps and bonobos, began to build sleeping platforms each night from sticks and other materials. Michael Probst AP

Primate evolution: Our long road to a good sleep

January 03, 2016 2:00 PM

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