Usage History of 'narcolepsy'

The following chart shows how frequently 'narcolepsy' appeared in printed materials over time. For example, the word 'narcolepsy' occurred 4 times in books in 1880 and 15,415 times in 2008. From 1880 to 2008, the word 'narcolepsy' was used a total of 253,825 times in books scanned by Google. See Reference: Google Ngram project.

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