It sounds plausible enough but I wonder why Ekirch (the historian referenced in the article) seems to be the only source for this theory? A quick look on Wikipe

It sounds plausible enough but I wonder why Ekirch (the historian referenced in the article) seems to be the only source for this theory? A quick look on Wikipedia [1] reveals no additional sources or scientific discussion either. It just seems a bit unlikely that such basic human behavior would be forgotten, only to be rediscovered by a single historian. Can anyone shed some light on how trustworthy this theory is? BTW I don't have any evidence or bias against this. I'm just genuinely curious and a bit confused. [1] http://en.wikipedia.org/wiki/Segmented_sleep http://en.wikipedia.org/wiki/Segmented_sleep