According to the American Academy of Sleep Medicine, 12% of US adults are diagnosed with chronic insomnia, a disorder that makes falling asleep and staying asleep difficult.

While treatment for insomnia can include medication, more and more people are turning to CBT-I (Cognitive Behavioral Therapy for Insomnia). This form of therapy is designed to address the root factors contributing to insomnia, rather than just medicating symptoms.

But how effective is it? We spoke to Dr Aric Prather, Sleep Advisor to wellness app Headspace, and the Director of the Behavioral Sleep Medicine Research Program at the University of California at San Francisco, to find out more following the launch of Headspace's new CBT-I sleep programme Finding Your Best Sleep. Here's what he told us...

How does CBT-I f

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