
But hold on! We are talking about sleep. Everybody does it. Everybody agrees it has biological purpose but nobody knows what the purpose is.


For the advance of human knowledge, science is based on paradigms, as observed by Thomas Kuhn in The Structure of Scientific Revolution. By paradigm, he meant a conceptual lens, a worldview, that helps us explain what we observe. Kuhn pointed out that while paradigms allow advancement of knowledge they also exclude other ways of looking at the world--ways that can also yield understanding.