Usage History of 'agrypnia'

The following chart shows how frequently 'agrypnia' appeared in printed materials over time. For example, the word 'agrypnia' occurred 1 time in books in 1766 and 85 times in 2008. From 1766 to 2008, the word 'agrypnia' was used a total of 3,654 times in books scanned by Google. See Reference: Google Ngram project.

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