Segmented Sleep Used To Be The Norm

Segmented Sleep Used To Be The Norm

Historian A. Roger Ekirch brought the trend of segmented sleep to light in 2001. His findings revealed that people used to divide their sleep into two separate periods, often referred to as "first sleep" and "second sleep." Between these periods, people would do chores, read, pray, or even go outside to visit friends. As electric lighting became more prominent, however, people began to stay up later and get their sleep all in one go.

10:10

from The Good Stuff

Key Facts In This Video

  • 1

    There is no solid scientific consensus on why we sleep. (1:56)

  • 2

    Black rhinos sleep for one to two hours laying down, and three to four hours standing up. (4:23)

  • 3

    Dolphins engage in unihemispheric sleep, which means that one half of the brain is resting while the other half is alert. (8:01)

See all

Asteroids

Dogs

Film

Time

Get smarter every day! Like us on Facebook.
You'll get the most interesting and engaging topics in your feed, straight from our team of experts.