Why do we have nightmares and how do they impact our sleep?

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It's a horrible feeling - waking up in a cold sweat after a nightmare. But just what is the cause of nightmares, how do they impact our sleep and is there anything we can do to avoid them? to discuss this is health scientist and sleep coach Tom Coleman.

Why do we have nightmares and how do they impact our sleep?

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Why do we have nightmares and how do they impact our sleep?
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