Why Do We Sleep?

Why Do We Sleep?

A third of our lives is spent sleeping, but our understanding of our body's need for sleep is still evolving. Take a look behind the science of dreams with these great videos.

02:35

Key Facts In This Video

  • 1

    Everybody has about three to seven dreams a night, even if they don't remember them. (0:17)

  • 2

    Performing "reality checks" in dreams can lead to the realization that you are dreaming. (0:36)

  • 3

    Trying to stay aware while the body falls asleep may cause the temporary condition known as sleep paralysis. (1:38)

03:55
09:03
03:07

from New Scientist

03:00

from Big Think

01:16:34

from Google Tech Talks

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