A single block of sleep is a relatively new behaviour, I suspect partially driven by the availability of cheap sources of light and heat.
https://www.bbc.com/future/article/20220107-the-lost-medieva...
replyThis is a contentious theory with little actual historical backing. Most likely people have been sleeping in one block since forever.
replyBut the article discussed here also points in that direction when it mentions the importance of people on the lookout at night. The article also mentions primitive tribes partying all night, so that is yet another direction.
reply> Most likely people have been sleeping in one block since forever.
replyDoes that have stronger historical backing?
It is more common in high-latitude countries.
Very uncommon in lower latitude.
replyThat theory is on rather shaky grounds: https://pmc.ncbi.nlm.nih.gov/articles/PMC10404514/
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