Usage History of 'narcolepsies'

The following chart shows how frequently 'narcolepsies' appeared in printed materials over time. For example, the word 'narcolepsies' occurred 4 times in books in 1922 and 14 times in 2008. From 1922 to 2008, the word 'narcolepsies' was used a total of 1,032 times in books scanned by Google. See Reference: Google Ngram project.

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