The guy who did this study spent 20 years. He found 500 'references to segmented sleep'. One of which being a painting depicting people not sleeping and sleepin

The guy who did this study spent 20 years. He found 500 'references to segmented sleep'. One of which being a painting depicting people not sleeping and sleeping simultaneously. That's less than one reference every 2 weeks. Either that guy had the most relaxing job in the world, or it is genuinely difficult to find such references. Assuming the latter to give the researcher the benefit of the doubt here; how deep do you have to look before you start to think that maybe this isn't actually that common after all? Also, how the bbc title reflects this study is beyond me.