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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.

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Key Facts In This Video

  1. Everybody has about three to seven dreams a night, even if they don't remember them. 00:17

  2. Performing "reality checks" in dreams can lead to the realization that you are dreaming. 00:36

  3. Trying to stay aware while the body falls asleep may cause the temporary condition known as sleep paralysis. 01:38

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