The myth of the eight-hour sleep
Sleeping in one eight-hour chunk is a very recent phenomenon, and lying awake at night could be good for you, according to scientists and historians.
www.bbc.com
Segmented Sleep in Preindustrial Societies
www.ncbi.nlm.nih.gov
https://www.psychologytoday.com/us/blog/sleepl…-may-be-natural