| http://www.w3.org/ns/prov#value | - Stress or psychological problems such as anxiety are the most common trigger for short-term or acute insomnia.Chronic insomnia: Chronic insomnia is long-term, and persists almost nightly for more than one month.Fatal familial insomnia: Fatal familial insomnia, or FFI, is a very rare inherited disease of the brain.
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