We’re getting much less sleep than we used to! Well, at least that’s been the story, but this story has largely been based on self-reported sleep times. If we are getting less sleep than we should, we need to know. One approach to understanding this subject better is to investigate what “natural” sleep looks like. Luckily, we now have more information on this due to a ground-breaking study recently published by Professor Jerry Siegel at UCLA, and colleagues in the journal Current Biology. In his study, he evaluated three societies living in natural conditions (e.g., modern day hunter-gatherers) to examine their sleep behaviors and physiology. He also analyzed external factors like natural light, ambient temperature and the season in which the data was collected. And by doing so, Dr. Siegel appeared to turn the wide-spread belief that we are chronically sleep deprived on its head. At least that seemed to be the emphasis of most news reports that came out describing the study. But to really understand what this data means, we need to discuss the study and interpret the findings with an emphasis to explain the difference between sleep period and sleep time. Along with an article investigating this subject, you can listen to my interview with Dr. Siegel where we discuss the study and his findings.