The word insomnia is often used to describe any form of trouble sleeping. Insomnia can mean nearly anything — trouble falling asleep for a single night, trouble staying asleep for a few weeks, or difficulty falling back to sleep for several months.

What does insomnia really refer to? Does it have a single, defined meaning, or can the term insomnia be applied broadly, as it often is? What’s the difference between short-term insomnia and insomnia as a sleep disorder?

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