Dr. Sanjay Gupta examines sleep, including the dangers of being over-tired; sleep disorders; and the meaning of dreams. Included: Gupta stays awake for 24 hours to learn first-hand how sleep deprivation impacts a person; and gauges his performance on a 747 flight simulator. Also: a woman who has difficulty sleeping through the night visits a sleep expert; parasomnia, which finds a sleeping person moving as if awake; and a look at dreams.
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