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What keeps you up at night? Are you thinking about deep questions? Want a big trip? Stressed by unfinished work? What if what was keeping you from sleeping was stress related to lack of sleep? This seemingly intractable loop is at the heart of insomnia, the world's most common sleep disorder. So, what is insomnia? And is there a way to break the cycle? Dan Kwartler breaks down the science of insomnia.

Lesson by Dan Kwartler, animation by Sharon Colman.

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