Very interesting. It is also much more informative than the Guardian article, for instance: "The data revealed that these groups all sleep for nightly blocks of

Very interesting. It is also much more informative than the Guardian article, for instance: "The data revealed that these groups all sleep for nightly blocks of 6.9 and 8.5 hours, and they spend at least 5.7 to 7.1 hours of those soundly asleep."