Why do we sleep?

O sleep, O gentle sleep,
Nature's soft nurse, how have I frighted thee,
That thou no more wilt weigh my eyelids down
And steep my sense in forgetfulness?
William Shakespeare,
Henry IV, Part I

We spend about a third of our lives sleeping and however, we know very little about it. Why do we have to sleep? What happens if we don't? How does it affect us?

Watch this video and answer the questions:

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video from ABC news
Read transcript

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