As to the answer to the title of this article: the article states that the sleep numbers for primates come from captivity and that when they did a study in the

As to the answer to the title of this article: the article states that the sleep numbers for primates come from captivity and that when they did a study in the wild the number was far less. So there’s not quite as much mystery here as it first seems. Humans sleep less, but not nearly as much as the numbers would suggest.