This article says:

> It’s his conviction that we are in the midst of a “catastrophic sleep-loss epidemic”, the consequences of which are far graver than any of us could imagine... sleep deprivation... constitutes anything less than seven hours

I thought we found out that we sleep the same as our ancestors. This article -- https://ca.news.yahoo.com/nightmare-sleep-no-more-plentiful-... -- says

> Even without electricity or other modern trappings, they [the Tsimane people of Bolivia, Hadza people of Tanzania and San people of Namibia] logged an average of 6 hours and 25 minutes of sleep daily, a figure near the low end of industrialized society averages.