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Do you really need 8 hours of sleep?

TED Business

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Sleep Medicine - What Is It?

Doctor calin carney is a psychologist and the director of the sleep in depression lab at ryerton university in toronto. Sleep medicine is a relatively new field, and studying sleep is kind of like peeling back the layers of an onion. We know that we need sleep, but we're still figuring out the amazing things it does for us.

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